- Larsson, M. 2006
- To bee or not to be: Critical floral resources of wild-bees. Acta Universitatis Upsaliensis. Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology 210: 33.
- Le Féon, V. 2010
- Insecte pollinisateurs dans les paysages agricoles : approche pluri-échelle du rôle des habitats semi-naturels, des pratiques agricoles et des cultures entomophiles. l’Université de Rennes.
- Le Goff G 2003
- Une nouvelle espèce ibérique du genre Hoplitis KLUG (Hymenoptera, Apoidea, Megachilidae). Bulletin de la Société Entomologique de France 108(1) : 67-70.
- Le Goff, G. 2004b
- Note sur des Hoplitis nidifidant dans des cavites rocheuses en Espagne: Hoplitis benoisti Alfken et Hoplitis anthocopoides Schenck). Leur nidification et leurs parasites. Lambillionea 104: 418-422.
- Le Goff, G. & M. Terzo. 1999
- Nouvelles observations sur Ceratina parvula Smith en France et en péninsule Ibérique (Hymenoptera, Xylocopinae). Bulletin de la Société entomologique de France, 104(1) :53-58.
- Le Goff, G., & Gonçalves, A.R. 2018
- Une nouvelle espèce de Protosmia DUCKE, 1900 découverte au Portugal: Protosmia (Protosmia) lusitanica nov.sp. (Apoidea, Megachilidae, Osmiini) Entomofauna 39/1 Heft 9: 187-191 Ansfelden
- Lebedev, A.G. 1933
- A contribution to the knowledge of the fauna and ecology of insect pollinator of plants. The bees of the environs of Kiev . Бджоли Кшвщини. Zbirnik Prats' Sektoru Ekologii Nazemnykh Tvarin 1: 13-50.
- Lefeber, V. 1995
- Leuke vangsten. Mededelingen over 1994. Nieuwsbrief sectie Hymenoptera van de Nederlandse Entomologische Vereniging 1: 2-3.
- Leiner, O. 1997
- Zur Biologie der Hummeln (Hymenoptera: Apidae) Bayerische Akademie für Naturschutz und Landschaftspflege 21: 83-88
- Leinonen, R., Söderman, G. and Kutenkova, N. 2006
- Results from pollinator monitoring in Kivach 1997–1999. Proceedings of the Karelian Research Center of the Russian Academy of Sciences 10 : 85-89.
- Levchenko, T.V. 2010
- Fauna and ecology of bees (Hymenoptera: Apoidea) of Moscow Region.
- Levchenko, T.V. and Yuferev, G.I. 2013
- Additions and corrections to the checklist of bees (Hymenoptera: Apoidea: Apiformes) of the Kirov Province. Transactions of the “Nurgush” State Nature Reserve 2(99-108).
- Lhomme, P. 2014
- Osmia scutellaris. The IUCN Red List of Threatened Species 2014: e.T19198711A21156632. Downloaded on 28 November 2018.
- Lhomme, P. 2014
- Osmia olgae. The IUCN Red List of Threatened Species 2014: e.T19198661A21156218. Downloaded on 28 November 2018.
- Lhomme, P. 2014
- Osmia fallax. The IUCN Red List of Threatened Species 2014: e.T19198941A21155236. Downloaded on 29 November 2018.
- Lhomme, P. 2014
- Osmia pinguis. The IUCN Red List of Threatened Species 2014: e.T19199094A21156459. Downloaded on 29 November 2018.
- Lhomme, P. 2014
- Osmia larochei. The IUCN Red List of Threatened Species 2014: e.T19198819A21155526. http://dx.doi.org/10.2305/IUCN.UK.2014-3.RLTS.T19198819A21155526.en. Downloaded on 28 November 2018.
- Lhomme, P. 2014
- Osmia labialis. The IUCN Red List of Threatened Species 2014: e.T19198533A21155520. Downloaded on 06 November 2018.
- Lhomme, P. 2014
- Osmia croatica. The IUCN Red List of Threatened Species 2014: e.T19198756A21154991. Downloaded on 29 November 2018.
- Lhomme, P. 2014
- Osmia anceyi. The IUCN Red List of Threatened Species 2014: e.T19199692A21154886. Downloaded on 29 November 2018.
- Lhomme, P. 2014
- Osmia distinguenda. The IUCN Red List of Threatened Species 2014: e.T19199570A21155072. Downloaded on 29 November 2018.
- Lhomme, P. 2014
- Osmia ligurica. The IUCN Red List of Threatened Species 2014: e.T19199191A21155691. Downloaded on 28 November 2018.
- Lhomme, P. 2014
- Hoplitis robusta. The IUCN Red List of Threatened Species 2014: e.T19198486A21154704. Downloaded on 20 November 2018.
- Lhomme, P. 2014
- Hoplitis illyrica. The IUCN Red List of Threatened Species 2014: e.T19198947A21154145. Downloaded on 07 January 2019
- Lhomme, P. 2014
- Osmia elegans. The IUCN Red List of Threatened Species 2014: e.T19198515A21155220. Downloaded on 29 November 2018.
- Lhomme, P. 2014
- Osmia padri. The IUCN Red List of Threatened Species 2014: e.T19199097A21156223. Downloaded on 28 November 2018.
- Lhomme, P. 2014
- Hoplitis parnesica. The IUCN Red List of Threatened Species 2014: e.T19198429A21154657. http://dx.doi.org/10.2305/IUCN.UK.2014-3.RLTS.T19198429A21154657.en. Downloaded on 08 January 2019
- Lhomme, P. 2014
- Hoplitis adunca. The IUCN Red List of Threatened Species 2014: e.T19199887A21152460. Downloaded on 02 October 2016
- Lhomme, P. 2014
- Osmia kohli. The IUCN Red List of Threatened Species 2014: e.T19199130A21155462. Downloaded on 30 March 2018.
- Lieftinck M. A. 1980
- Prodrome to a monograph of the Palaearctic species of the genus Melecta Latreille 1802. Tijdschrift voor Entomologie 123: 129- 349.
- Lieftinck, M. A. 1966
- Notes on some anthophorine bees, mainly from the Old World. Tijdschrift voor Entomologie 109: 125-161.
- Lieftinck, M. A. 1968
- A review of old world species of Thyreus PANZER (= Crocisa JURINE)(Hym., Apoidea, Anthophoridae) Part 4. Palearctic species. Zoologische Verhandelingen, 98(1), 1-139.
- Lieftinck, M.A. 1972
- Further studies on Old World Melectine bees, with stray notes on their distribution and host relationships (Hymenoptera, Anthophoridae),. Tijdschrift voor Entomologie 115(7): 1-55, 2pls.
- Lieftinck, M.A. 1969
- The Melectine genus Eupavlovskia. Tijdschrift v. entomol. Deel 112: Afl 4. pp103-121
- Lilleleht, V. 2001
- Red Data Book of Estonia. Available at: http://www.zbi.ee/punane/muu/saateks_e.html.
- Linkowski, W., Pettersson, M. W., Cederberg, B., and Nilsson, L. A. 2004
- Nyskapande av livsmiljöer och aktiv spridning av vildbin. In: Svenska Vildbiprojektet vid (ed.). ArtDatabanken, SLU, & Avdelningen för växtekologi, Uppsala Univeritet.
- Lukáš, J. 2001
- Červený zoznam blanokrídlovcov (Hymenoptera) Slovenska (december 2001). [Red list of Hymenoptera of Slovakia, December 2001]. . In: D, Baláž, K, Marhold and P, Urban. (eds), Červený zoznam rastlín a živo č íchov Slovenska. [Red list of plants and animals of Slovakia], pp. 129-133. Ochrana Prírody.
- Lukáš, J. 1998
- K poznaniu opeľovačov tnky obyčajnej (Prunus spinosa) na území Slovenska. Folia faunistica Slovaca 3 : 125-127.
- Lukáš, J., Lukášová, Z. and Schlarmannová, J. 1999
- Včely (Hymenoptera, Apoidea) Čachtických vrchov . Folia faunistica Slovaca 4 : 89-96.
- Luna de Carvalho, E. 1972
- Contribuição para o estudo dos Stylops da peninsula iberica (Strepsiptera, Stylopidae). Eos 48: 301-365.
- Lykov, V.A. 2004
- To the bee fauna material (Hymenoptera: Apoidae: Andrenidae) of the Perm region. Vestnik Permskogo Universiteta, Biologiya 2: 72-75.
- Lykov, V.A. 2007
- The bee fauna review (Hymenoptera, Apoidea) of the Perm Area. Vestnik Permskogo Universiteta, Biologiya 5(10): 61-68.
- Lykov, V.A. 2008
- The bees (Hymenoptera, Apoidea) of the insular Kungur forest-steppe]. Vestnik Permskogo Universiteta, Biologiya 9(25): 32-36.
- Lykov, V.A. 2008
- The bees (Hymenoptera, Apoidea) of the insular Kungur forest-steppe. Bulletin of the Perm University. Series: “Biology”. 9:32–36.
- Løken A. 1973
- Studies on Scandinavian Bumble Bees (Hymenoptera, Apidae). Norsk entomologisk Tidsskrift, 20(1): 1-218