- Radchenko, V. 2015
- Andrena ovatula. The IUCN Red List of Threatened Species 2015: e.T19199043A21312083. Downloaded on 01 October 2017.
- Radchenko, V. 2015
- Andrena transitoria. The IUCN Red List of Threatened Species 2015: e.T19198480A21313601. Downloaded on 27 November 2017.
- Radchenko, V. 2014
- Andrena olympica. The IUCN Red List of Threatened Species 2014: e.T19198562A19201320. http://dx.doi.org/10.2305/IUCN.UK.2014-2.RLTS.T19198562A19201320.en. Downloaded on 21 December 2018.
- Radchenko, V. 2015
- Andrena rosae. The IUCN Red List of Threatened Species 2015: e.T19198501A21312567. Downloaded on 02 October 2017
- Radchenko, V. 2015
- Andrena pandellei. The IUCN Red List of Threatened Species 2015: e.T19199378A21312106. Downloaded on 02 October 2017.
- Radchenko, V. 2015
- Andrena taraxaci. The IUCN Red List of Threatened Species 2015: e.T19198870A21313796. Downloaded on 04 October 2017
- Radchenko, V. 2015
- Andrena pallitarsis. The IUCN Red List of Threatened Species 2015: e.T19198498A21312089. Downloaded on 02 October 2017.
- Radchenko, V. 2014
- Andrena troodica. The IUCN Red List of Threatened Species 2014: e.T19199879A19201945. Downloaded on 22 February 2018.
- Radchenko, V. 2015
- Andrena ranunculorum. The IUCN Red List of Threatened Species 2015: e.T19198966A21312520. Downloaded on 02 October 2017.
- Radchenko, V. 2014
- Andrena westensis. The IUCN Red List of Threatened Species 2014: e.T19198510A19202065. Downloaded on 01 January 2019.
- Radchenko, V. 2015
- Andrena pusilla. The IUCN Red List of Threatened Species 2015: e.T19198384A21312515. Downloaded on 02 October 2017.
- Radchenko, V. 2015
- Andrena paramythensis. The IUCN Red List of Threatened Species 2015: e.T19199388A43114514. Downloaded on 02 January 2019.
- Radchenko, V. 2015
- Andrena rufula. The IUCN Red List of Threatened Species 2015: e.T19199155A21312578. Downloaded on 20 September 2017.
- Radchenko, V. 2014
- Andrena pastellensis. The IUCN Red List of Threatened Species 2014: e.T19198962A19201435. http://dx.doi.org/10.2305/IUCN.UK.2014-2.RLTS.T19198962A19201435.en. Downloaded on 02 October 2017.
- Radchenko, V. 2015
- Andrena scita. The IUCN Red List of Threatened Species 2015: e.T19199267A21312687. Downloaded on 02 January 2019.
- Radchenko, V. 2015
- Andrena praecox. The IUCN Red List of Threatened Species 2015: e.T19199946A21312396. Downloaded on 02 October 2017
- Radchenko, V. 2015
- Andrena schencki. The IUCN Red List of Threatened Species 2015: e.T19199232A21312675. Downloaded on 03 October 2017.
- Radchenko, V. 2015
- Andrena polita. The IUCN Red List of Threatened Species 2015: e.T19199625A21312267. Downloaded on 02 October 2017
- Radchenko, V. 2014
- Andrena vetula. The IUCN Red List of Threatened Species 2014: e.T19199638A19202035. Downloaded on 03 September 2016
- Radchenko, V. 2015
- Andrena pilipes. The IUCN Red List of Threatened Species 2015: e.T19199427A21312201. Downloaded on 02 October 2017.
- Radchenko, V. 2015
- Andrena rugulosa. The IUCN Red List of Threatened Species 2015: e.T19198538A21312654. Downloaded on 03 October 2017.
- Radchenko, V. 2015
- Andrena potentillae. The IUCN Red List of Threatened Species 2015: e.T19199698A21312391. Downloaded on 02 October 2017.
- Radchenko, V. 2014
- Andrena torda. The IUCN Red List of Threatened Species 2014: e.T19198804A19201910. Downloaded on 22 February 2018.
- Radchenko, V. 2015
- Andrena synadelpha. The IUCN Red List of Threatened Species 2015: e.T19198926A21312963. Downloaded on 04 October 2017.
- Radchenko, V. 2015
- Andrena optata. The IUCN Red List of Threatened Species 2015: e.T19199107A43114430. Downloaded on 02 January 2019.
- Radchenko, V. & Roberts, S. 2013
- Andrena tridentata. The IUCN Red List of Threatened Species 2013: e.T19198777A43114652. Downloaded on 04 October 2017.
- Radchenko, V., Kemp, J.R. & Roberts, S. 2013
- Andrena limonii. The IUCN Red List of Threatened Species 2013: e.T48069109A48073527. Downloaded on 07 January 2019.
- Radchenko, V.G. 1981
- Nesting of bees of 4 species of the genus Andrena (Hymenoptera Andrenidae) Entomologicheskoe Obozrenie, 60 (4), 766-774.
- Radchenko, V.G. 2017
- A new bee species of the genus Dasypoda Latreille (Hymenoptera, Apoidea) from Portugal with comparative remarks on the subgenus Heterodasypoda Michez. Zootaxa 4350 (1): 164–176.
- Radchenko, V.G. 1982
- Biology of bees (Hymenoptera, Apoidea) of the south-east Ukraine. Institute of Zoology.
- Radchenko, V.G. 2016
- A new widespread European bee species of the genus Dasypoda Latreille (Hymenoptera, Apoidea). Zootaxa, 4184(3), pp.491-504.
- Radchenko, V.G. 2009
- Andrena (Melandrena) magna Warncke, 1965 . In: Akimov, A.I. (ed.), Red Book of Ukraine. Animals., pp. 623. Globalkonsaltyng, Kiev.
- Radchenko, V.G. 1982
- A method for the accumulation and maintenance of abundance of alfalfa pollinators at the nature conditions . In: V.S. Grebennikov (ed.), Insect Pollinators of Agricultural Plants. , pp. 132–135. iberian Branch of the All-Union Academy of Agricultural Sciences, Novosibirsk.
- Radchenko, V.G. and Pesenko, Y. 1994
- Biology of bees (Hymenoptera, Apoidea). Zoological Institute Russian Academy of Sciences, S-Petersburg.
- Radchenko,V.G., Ivanov, S.P. 2004
- ; Note on Andrena stigmatica. Vestnik zoologii, 38 (7): 70
- Radoszkowski, O. 1871
- Hyménoptères de l’Asie. Description et énumération de quelques espèces reçues de Samarkand, Astrabad, Himalaya et Ning-Po, en Chine. Horae Societatis Entomologicae Rossicae (St. Petersburg) 8(3): 187–200.
- Raemakers I. 2005
- De schermbloemzandbij Andrena nitidiuscula terug in Nederland (Hymenoptera: Apidae). . Nederlandse Faunistische Mededelingen 23: 13-16.
- Raemakers, I. 2009
- Leuke waarnemingen 2008. Nieuwsbrief Sectie Hymenoptera Nederlandse Entomologische Vereniging 29: 13-16.
- Raemakers, I., van den Eijnde, T. and Kleukers, R. 2004
- Laatste kans voor de bijzondere stuifzandsoorten van de Tungelerwallen [Last chance for there are drift sand species at the Tungelerwallen]. Natuurhistorisch Maandblad 93: 290-296.
- Rasmont P, Ebmer PA, Banaszak J, van der Zanden G. 1995
- Hymenoptera Apoidea Gallica. Liste taxonomique des abeilles de France, de Belgique, de Suisse et du Grand-Duché de Luxembourg. Bulletin de la Société Entomologique de France. 100:1–98.
- Rasmont P. & Iserbyt I. 2010
- 2013. Atlas of the European Bees: genus Bombus. 3d Edition. STEP Project, Atlas Hymenoptera, Mons, Gembloux. http://www.atlashymenoptera.net/page.asp?ID=169
- Rasmont P., J. Leclercq, A. Jacob-Remacle, A. Pauly & C. Gaspar 1993
- The faunistic drift of Apoidea in Belgium. pp.65-87 in E. Bruneau, Bees for pollination. Commission of the European Communities, Brussels, 237 pp.
- Rasmont, P. 2014
- Atlas of the European Bees: genus Melecta. Mons, Gembloux. Available at: http://www.zoologie.umh.ac.be//hymenoptera/page.asp?ID=256.
- Rasmont, P. 2014
- Atlas of the European Bees: genus Anthophora. Mons, Gembloux Available at: http://www.zoologie.umh.ac.be//hymenoptera/page.asp?ID=260. 31 (1), 3-20
- Rasmont, P. 1995
- Les Anthophores de France du sous-genre Lophanthophora Brooks avec la redescription de trois espèces au statut confus (Hymenoptera: Apoidea: Anthophorinae). Annales de la Société entomologique de France (N.S.) 31(1): 3-20.
- Rasmont, P. 2014
- Atlas of the European Bees: genus Anthophora. Mons, Gembloux Available at: http://www.zoologie.umh.ac.be//hymenoptera/page.asp?ID=260.
- Rasmont, P. 1983
- Catalogue commenté des bourdons de la région Ouest-Paléarctique. Notes fauniques de Gembloux No.7
- Rasmont, P. 2014
- Atlas of the European Bees: genus Habropoda. Mons, Gembloux Available at: http://www.zoologie.umh.ac.be//hymenoptera/page.asp?ID=261 .
- Rasmont, P. 1988
- Monographie écologique et zoogéographique des Bourdons de France et de Belgique (Hymenoptetera, Apidae, Bombinae). Unpublished PhD Thesis, Gembloux
- Rasmont, P. 2014
- Atlas of the European Bees: genus Amegilla. Mons, Gembloux Available at: http://www.zoologie.umh.ac.be//hymenoptera/page.asp?ID=259.
- Rasmont, P. 1995
- Les anthophores de France du sous-genre Lophanthophora Brooks avec la redescription de trois espèces au statut confus (Hymenoptera: Apoidea: Anthophorinae) Annales de la Société entomologique de France 31 (1), 3-20
- Rasmont, P. & A. Adamski. 1995
- Les Bourdons de la Corse (Hymenoptera, Apoidea, Bombinae). Notes Fauniques de Gembloux, 31:3-87.
- Rasmont, P. & Dehon, M. 2015
- Anthophora dispar. The IUCN Red List of Threatened Species 2015: e.T19199580A21768828. Downloaded on 27 April 2019.
- Rasmont, P. & Dehon, M. 2015
- Melecta baeri. The IUCN Red List of Threatened Species 2015: e.T19199699A21463057. Downloaded on 15 April 2019
- Rasmont, P. & Dehon, M. 2015
- Anthophora hispanica. The IUCN Red List of Threatened Species 2015: e.T19199560A21776216. Downloaded on 28 April 2019.
- Rasmont, P. & Dehon, M. 2015
- Anthophora harmalae. The IUCN Red List of Threatened Species 2015: e.T63774116A64174069. Downloaded on 24 December 2017.
- Rasmont, P. & Dehon, M. 2015
- Habropoda tarsata. The IUCN Red List of Threatened Species 2015: e.T19199553A21462934. Downloaded on 27 April 2019.
- Rasmont, P. & Dehon, M. 2015
- Habropoda zonatula. The IUCN Red List of Threatened Species 2015: e.T19198980A21462940. Downloaded on 27 April 2019.
- Rasmont, P. & Dehon, M. 2015
- Anthophora dubia. The IUCN Red List of Threatened Species 2015: e.T63772574A64173981. Downloaded on 27 April 2019.
- Rasmont, P. & Dehon, M. 2015
- Amegilla magnilabris. The IUCN Red List of Threatened Species 2015: e.T58882895A59132354. Downloaded on 27 April 2019.
- Rasmont, P. & Dehon, M. 2015
- Anthophora balneorum. The IUCN Red List of Threatened Species 2015: e.T19198585A21767921. Downloaded on 07 January 2019.
- Rasmont, P. & Dehon, M. 2015
- Melecta mundula. The IUCN Red List of Threatened Species 2015: e.T19199591A21463165. Downloaded on 15 April 2019.
- Rasmont, P. & Dehon, M. 2015
- Melecta tuberculata. The IUCN Red List of Threatened Species 2015: e.T19199105A21463184. Downloaded on 01 December 2017.
- Rasmont, P. & Dehon, M. 2015
- Ancyla holtzi. The IUCN Red List of Threatened Species 2015: e.T19199113A21766728. Downloaded on 23 December 2017.
- Rasmont, P. & Dehon, M. 2015
- Habropoda ezonata. The IUCN Red List of Threatened Species 2015: e.T19198359A21462927. http://dx.doi.org/10.2305/IUCN.UK.2015-1.RLTS.T19198359A21462927.en. Downloaded on 27 April 2019.
- Rasmont, P. and Dehon, M. 2014
- Atlas of the European Bees: genus Ancyla. Available at: http://www.zoologie.umh.ac.be//hymenoptera/page.asp?ID=262 .
- Rasmont, P. and Iserbyt, I. 2010
- 2012. Atlas of the European Bees: genus Bombus. STEP Project. Atlas Hymenoptera. Mons Available at: http://www.zoologie.umh.ac.be//hymenoptera/page.asp?ID=169.
- Rasmont, P. and Iserbyt, S. 2012
- The Bumblebees Scarcity Syndrome: Are heat waves leading to local extinctions of bumblebees (Hymenoptera: Apidae: Bombus)? Annales de la Société entomologique de France (N.S.) 48(3-4): 275-280.
- Rasmont, P., Dehon, M. & Ortiz Sánchez, F.J. 2015
- Melecta gracilipes. The IUCN Red List of Threatened Species 2015: e.T19199225A21463106. http://dx.doi.org/10.2305/IUCN.UK.2015-1.RLTS.T19199225A21463106.en. Downloaded on 15 April 2019.
- Rasmont, P., Devalez, J., Pauly, A., Michez, D. & Radchenko, V.G. 2017
- Addition to the checklist of IUCN European wild bees (Hymenoptera: Apoidea), Annales de la Société entomologique de France (N..), 53:1, 17-32, DOI: 10.1080/00379271.2017.1307696
- Rasmont, P., Ebmer, P.A., Banaszak, J., and van der Zanden, G. 1995
- Hymenoptera Apoidea Gallica. Liste taxonomique des abeilles de France, de Belgique, de Suisse et du Grand-Duché de Luxembourg. Bulletin de Ia Société entomologique de France 100 (hors série): 1-98.
- Rasmont, P., Leclercq, J., Jacob-Remacle, A., Pauly A. and Gaspar, C. 1993
- The faunistic drift of Apoidea in Belgium. In: E. Bruneau (ed.), Bees for pollination, pp. 65-87. Commission of the European Communities, Brussels.
- Rasmont, P., P.A. Ebmer, J. Banaszak & G. van der Zanden 1995
- Hymenoptera Apoidea Gallica. Liste taxonomique des abeilles de France, de Belgique, de Suisse et du Grand-Duché de Luxembourg. Bulletin de la Société entomologique de France, 100 (H.S.): 1-98.
- Rasmont, P., P.A. Ebmer, J. Banaszak & G. van der Zanden 1995
- Hymenoptera Apoidea Gallica. Liste taxonomique des abeilles de France, de Belgique, de Suisse et du Grand-Duché de Luxembourg. Bulletin de la Société entomologique de France, 100(H.S.): 1-98.
- Rasmont, P., P.A. Ebmer, J. Banaszak & G. van der Zanden 1995
- Hymenoptera Apoidea Gallica. Liste taxonomique des abeilles de France, de Belgique, de Suisse et du Grand-Duché de Luxembourg. Bulletin de la Société entomologique de France, 100(H.S.): 1-98.Fateryga, A.V., Ivanov, S.P., & Filatov, M.A., 2018 Megachilid-bees (Hymenoptera: Megachilidae) of the Crimean Peninsula Entomofauna 39/1 Heft 11: 235-283
- Rasmont, P., Pauly, A., Terzo, M., Patiny, S., Michez, D., Iserbyt, S., Barbier, Y., Haubruge, E. 2005
- The survey of wild bees (Hymenoptera, Apoidea) in Belgium and France. Universite de Mons Hainaut - Faculte Universitaire des Sciences Agronomiques de Gembloux - Food and Agriculture Organization.
- Rasmont, P., Roberts, S., Cederberg, B., Radchenko, V. & Michez, D. 2015
- Bombus gerstaeckeri. The IUCN Red List of Threatened Species 2015: e.T13340374A57347749. Downloaded on 13 October 2017.
- Rasmont, P., Roberts, S.P.M., Michez, D., Schweiger, O., Franzen, M., De Meulemeester, T., Tomozei, B., and Radchenko, V. 2013
- Atlas of the European Bees: genus Andrena. Mons Available at: http://www.zoologie.umh.ac.be//hymenoptera/page.asp?ID=243.
- Rasmussen, C. 2014
- A preliminary species list of Danish bees (Hymenoptera: Apoidea). Available at: http://danmark.melipona.org/index.html . (Accessed: 14.08.2014).
- Rašomavičius, V. (ed.). 2007
- Red Data Book of Lithuania (Lietuvos Raudonoji Knyga). pp. 800. Ministry of Environment of the Republic of Lithuania, Vilnius.
- Rassi, P., Alanen, A., Kanerva, T. and Mannerkoski, I. (eds.). 2001
- Suomen lajien uhanalaisuus 2000 [The 2000 Red List of Finnish species]. Ympäristöministeriö & Suomen ympäristökeskus, Helsinki.
- Rassi, P., Alanen, A., Kanerva, T. and Mannerkoski, I. (eds.). 2001
- The Red List of Finnish Species (English Summary). Ministry of the Environment & Finnish Environment Institute, Helsinki.
- Rassi, P., Hyvärinen, E., Juslén, A. and Mannerkoski, I. (eds). 2010
- The 2010 Red List of Finnish Species. pp. 685. Ympäristöministeriö and Suomen ympäristökeskus [Ministry of the Environment and Finnish Environment Institute], Helsinki.
- Rasulov, M. 1966
- Insect pollinators of apple, pear, and quince-trees . In: Ibragimov, M. (ed.), Research of Natural Resources in the Ferghana Valley, pp. 35-38. Tashkent (Fan).
- Raw, A. 2004
- Leafcutter and Mason Bees: a Biological Catalogue of the Genus Megachile of the Neotropics
- Rebmann O. 1968
- 3. Beitrag zur Kenntnis der Gattung Megachile LATR. (Hym. Apidae). Subgenus Eutricharaea und seine bisher bekanntgewordenen Arten. Deutsche Entomologische Zeitschrift N. F. 15:21–48.
- Reemer, M. and Meer van der, F. 2001
- Bijen en graafwespen langs Kanaal Almelo-Nordhorn. Stichting European Invertebrate Survey, Leiden.
- Reemer, M., Groenenberg, D.S.J., Achterberg, C. van and Peeters, M.J. 2008
- Taxonomic Assessment of Andrena rosae and Andrena stragulata by DNA-Sequencing (Hymenoptera: Apoidea: Andrenidae) . Entomologia Generalis 31(1): 021-032.
- Reemer, M., Rond, J. 2014
- Soortzoeker Tuinbijen van Nederland (Apidae)
- Ricciardelli D'Albore, G. and Intoppa F. 2000
- Fiori e api. La flora visitata dalle api e dagli Apoidei in Europa Versione bilingue italiana-inglese. Calderini, Edagricole, Bologna.
- Richardson, L. L. and R. E. Irwin. 2015
- Pollination ecology and floral visitor spectrum of turtlehead (Chelone glabra L.; Plantaginaceae). J. Poll. Ecol. 17:132-144.
- Risch, S. 2003
- Die Arten der Gattung Eucera SCOPOLI1770 (Hymenoptera, Apidae) Die Untergattungen Stibeucera Tkalců 1979, Atopeucera Tkalců 1984 und Hemieucera SITDIKOV & PESENKO 1988. Linzer Biologische Beiträge 35(2): 1241-1292.
- Risch, S. 2003
- Die Arten der Gattung Eucera SCOPOLI 1770 (Hymenoptera, Apidae) Die Untergattungen Stibeucera Tkalců 1979, Atopeucera Tkalců 1984 und Hemieucera SITDIKOV & PESENKO 1988. Linzer Biologische Beiträge 35(2): 1241-1292.
- Ritsema, C. 1881
- Tweede Supplement op de Naamlijst der Nederlandsche Hymenoptera Anthophila. Tijdschrift voor Entomologie: 24: cxxiii-cxxviii.
- Roberts, S. 2014
- Andrena rogenhoferi. The IUCN Red List of Threatened Species 2014: e.T19199941A19201585. http://dx.doi.org/10.2305/IUCN.UK.2014-3.RLTS.T19199941A19201585.en. Downloaded on 02 October 2017.
- Roberts, S. 2014
- Andrena anthrisci. The IUCN Red List of Threatened Species 2014: e.T19199512A43066930. http://dx.doi.org/10.2305/IUCN.UK.2014-3.RLTS.T19199512A43066930.en. Downloaded on 19 September 2017.
- Roberts, S. 2014
- Andrena rhenana. The IUCN Red List of Threatened Species 2014: e.T19199752A19201565. http://dx.doi.org/10.2305/IUCN.UK.2014-3.RLTS.T19199752A19201565.en. Downloaded on 02 October 2017
- Roberts, S. 2014
- Andrena allosa. The IUCN Red List of Threatened Species 2014: e.T19198512A43066905. Downloaded on 19 September 2017.
- Roberts, S. 2014
- Andrena strohmella. The IUCN Red List of Threatened Species 2014: e.T19198572A19201820. http://dx.doi.org/10.2305/IUCN.UK.2014-3.RLTS.T19198572A19201820.en. Downloaded on 04 October 2017.
- Roberts, S. 2014
- Andrena tenuiformis. The IUCN Red List of Threatened Species 2014: e.T19199836A19201870. Downloaded on 27 February 2018.
- Roberts, S. 2014
- Andrena simontornyella. The IUCN Red List of Threatened Species 2014: e.T19198791A19201760. Downloaded on 04 October 2017.
- Roberts, S. 2014
- Andrena afrensis. The IUCN Red List of Threatened Species 2014: e.T19198794A43066886. http://dx.doi.org/10.2305/IUCN.UK.2014-3.RLTS.T19198794A43066886.en. Downloaded on 19 September 2017.
- Roberts, S. 2014
- Andrena palumba. The IUCN Red List of Threatened Species 2014: e.T19198404A19201390. Downloaded on 07 January 2019.
- Roberts, S. 2014
- Andrena spolata. The IUCN Red List of Threatened Species 2014: e.T19199453A19201780. Downloaded on 07 January 2019.
- Roberts, S. 2014
- Andrena oviventris. The IUCN Red List of Threatened Species 2014: e.T19198940A19201370. Downloaded on 02 June 2018.
- Roberts, S. 2014
- Andrena probata. The IUCN Red List of Threatened Species 2014: e.T19199249A19201490. Downloaded on 02 October 2017.
- Roberts, S. 2014
- Andrena asperrima. The IUCN Red List of Threatened Species 2014: e.T19199554A43066943. Downloaded on 14 September 2016.
- Roberts, S. 2014
- Andrena brumanensis. The IUCN Red List of Threatened Species 2014: e.T19198760A43067080. Downloaded on 28 December 2018.
- Roberts, S. 2014
- Andrena pellucens. The IUCN Red List of Threatened Species 2014: e.T19199351A19201445. http://dx.doi.org/10.2305/IUCN.UK.2014-3.RLTS.T19199351A19201445.en. Downloaded on 14 November 2018.
- Roberts, S. & de Meulemeester, T. 2015
- Andrena freygessneri. The IUCN Red List of Threatened Species 2015: e.T19199922A43509754. http://dx.doi.org/10.2305/IUCN.UK.2015-1.RLTS.T19199922A43509754.en. Downloaded on 06 November 2018
- Roberts, S. & de Meulemeester, T. 2015
- Andrena illyrica. The IUCN Red List of Threatened Species 2015: e.T19199169A43510070. http://dx.doi.org/10.2305/IUCN.UK.2015-1.RLTS.T19199169A43510070.en. Downloaded on 08 January 2019.
- Roberts, S. & de Meulemeester, T. 2015
- Andrena dargia. The IUCN Red List of Threatened Species 2015: e.T19199779A43509607. Downloaded on 22 February 2018.
- Roberts, S. & de Meulemeester, T. 2015
- Andrena hispania. The IUCN Red List of Threatened Species 2015: e.T19199931A43510000. Downloaded on 02 June 2018.
- Roberts, S. & de Meulemeester, T. 2015
- Andrena neovirida. The IUCN Red List of Threatened Species 2015: e.T19199467A43510570. http://dx.doi.org/10.2305/IUCN.UK.2015-1.RLTS.T19199467A43510570.en. Downloaded on 21 December 2018.
- Roberts, S. & de Meulemeester, T. 2015
- Andrena glidia. The IUCN Red List of Threatened Species 2015: e.T19198460A43509925. Downloaded on 23 December 2018.
- Roberts, S. & de Meulemeester, T. 2015
- Andrena muscaria. The IUCN Red List of Threatened Species 2015: e.T19198891A43510530. http://dx.doi.org/10.2305/IUCN.UK.2015-1.RLTS.T19198891A43510530.en. Downloaded on 27 December 2018.
- Roberts, S. & de Meulemeester, T. 2015
- Andrena medeninensis. The IUCN Red List of Threatened Species 2015: e.T19199643A43510361. Downloaded on 07 January 2019.
- Roberts, S. & de Meulemeester, T. 2015
- Andrena kornosica. The IUCN Red List of Threatened Species 2015: e.T19198751A43510164. http://dx.doi.org/10.2305/IUCN.UK.2015-1.RLTS.T19198751A43510164.en. Downloaded on 29 October 2017.
- Roberts, S. & de Meulemeester, T. 2015
- Andrena nigroolivacea. The IUCN Red List of Threatened Species 2015: e.T19198890A43510582. Downloaded on 30 September 2017.
- Roberts, S. & de Meulemeester, T. 2015
- Andrena monacha. The IUCN Red List of Threatened Species 2015: e.T19198588A43510431. Downloaded on 27 February 2018.
- Roberts, S. & de Meulemeester, T. 2015
- Andrena montana. The IUCN Red List of Threatened Species 2015: e.T19199209A43510449. http://dx.doi.org/10.2305/IUCN.UK.2015-1.RLTS.T19199209A43510449.en. Downloaded on 30 September 2017.
- Roberts, S. & de Meulemeester, T. 2015
- Andrena heinrichi. The IUCN Red List of Threatened Species 2015: e.T19198392A43510417. Downloaded on 21 December 2018.
- Roberts, S. & de Meulemeester, T. 2015
- Andrena livens. The IUCN Red List of Threatened Species 2015: e.T19199266A43510330. Downloaded on 28 September 2017.
- Roberts, S. & de Meulemeester, T. 2015
- Andrena lamiana. The IUCN Red List of Threatened Species 2015: e.T19198704A43510203. Downloaded on 22 December 2018.
- Roberts, S. & de Meulemeester, T. 2015
- Andrena lagopus. The IUCN Red List of Threatened Species 2015: e.T19199520A43510181. Downloaded on 27 September 2017.
- Roberts, S. & de Meulemeester, T. 2015
- Andrena merula. The IUCN Red List of Threatened Species 2015: e.T19198605A43510387. Downloaded on 28 December 2018.
- Roberts, S. & de Meulemeester, T. 2015
- Andrena ebmerella. The IUCN Red List of Threatened Species 2015: e.T21138032A43509688. http://dx.doi.org/10.2305/IUCN.UK.2015-1.RLTS.T21138032A43509688.en. Downloaded on 21 December 2018.
- Roberts, S. & de Meulemeester, T. 2015
- Andrena curtula. The IUCN Red List of Threatened Species 2015: e.T19199110A43509447. http://dx.doi.org/10.2305/IUCN.UK.2015-1.RLTS.T19199110A43509447.en. Downloaded on 21 September 2017.
- Roberts, S. & de Meulemeester, T. 2015
- Andrena mistrensis. The IUCN Red List of Threatened Species 2015: e.T19198392A43510417. Downloaded on 21 December 2018.
- Roberts, S. & de Meulemeester, T. 2015
- Andrena leucopsis. The IUCN Red List of Threatened Species 2015: e.T19199925A43510312. Downloaded on 03 January 2019
- Roberts, S.P.M., Straka, J. and Schweiger, O. 2014
- Climatic Risk Atlas of European Bumblebees. Pensoft publishing, Sofia (in prep.).
- Romankova, T.G. 1995
- 73. Family Megachlidae. Megachilid bees. In: Lehr, P.A. (ed.), Key to the insects of Russian Far East in six volumes, pp. 530-547. Russian Academy of Sciences, St. Petersburg.
- Ronayne, C.S. 2006
- Ecological Study of the Coastal Habitats in County Fingal Phase IV – Bees. Fingal Biodiversity Programme.
- Rond de, J. 2013
- Wilde bijen in Lelystad .
- Rothney, J. 1881
- Notes on captures of British Aculeate Hymenopfera. Entomologist's Monthly Magazine 18(262).
- Rozen, J.G. 1967
- Review of the biology of Panurgine bees, with observations on North American forms (Hymenoptera: Apoidea). American Museum Novitates,
- Rozen, J.G. 1967
- Review of the biology of Panurgine bees, with observations on North American forms (Hymenoptera: Apoidea). American Museum Novitates, 2297
- Rozen, J.G., Jr., and Kamel, S.M. 2008
- Hospicidal behavior of the cleptoparasitic bee Coelioxys (Allocoelioxys) coturnix, including descriptions of its larval instars (Hymenoptera: Megachilidae). Am. Mus. Novitates 3636: 1--15.
- Rozen, J.G., Jr., and Kamel, S.M. 2007
- Investigations on the biologies and immature stages of the cleoptoparasitic bee genera Radoszkowskiana and Coelioxys and their Megachile hosts (Hymenoptera: Apoidea: Megachilidae: Megachilini). Am. Mus. Novitates 3573: 1-43.
- Ruchin, A. 2008
- Check-List of species of Hymenoptera, belonging to the family Andrenidae, which are registered in the Republic of Mordovia. In: The Nature of the Republic of Mordovia. Available at: http://nature-mordovia.ru/.
- Ruggiero M. (project leader), Ascher J. et al. 2017
- ITIS Bees: World Bee Checklist (version Sep 2009). In: Roskov Y., Abucay L., Orrell T., Nicolson D., Bailly N., Kirk P.M., Bourgoin T., DeWalt R.E., Decock W., De Wever A., Nieukerken E. van, Zarucchi J., Penev L., eds. (2017). Species 2000 & ITIS Catalogue of Life, 20th December 2017. Digital resource at www.catalogueoflife.org/col. Species 2000: Naturalis, Leiden, the Netherlands. ISSN 2405-8858.
- Ruggiero M., Ascher J. et al. 2019
- ITIS Bees: World Bee Checklist (version Sep 2009). In: Species 2000 & ITIS Catalogue of Life, 25th March 2019 (Roskov Y., Ower G., Orrell T., Nicolson D., Bailly N., Kirk P.M., Bourgoin T., DeWalt R.E., Decock W., Nieukerken E. van, Zarucchi J., Penev L., eds.). Digital resource at www.catalogueoflife.org/col. Species 2000: Naturalis, Leiden, the Netherlands. ISSN 2405-8858.
- Ruiz, L. 2012
- Contribución al conocimiento de los insectos visitantes de Campanulaceae en la Península Ibérica . Micobotánica-Jaén 7(1): 2-22.
- Rymashevskiy, V.K. and Rymashevskaya, R.S. 1958
- On the pollination of fruit and berry plants. Uchen. Zapiski Michurinsk. Pedagog. Inst. (Michurinsk). 6: 149-158.