- Calabuig, I. and Madsen, H.B. 2009
- Annotated checklist of the Bees in Denmark - Part 2: Andrenidae (Hymenoptera, Apoidea). Entomology Mediterranean 77: 83-113.
- Capelo J,A., Menezes de Sequeira M., Jardim R., Costa J.C. 2004
- Guia da excursão geobotânica dos V Encontros ALFA 2004 à ilha da Madeira. — In: Capelo J.A. (Ed.): Paisagem vegetal da ilha da Madeira. — Quercetea 6: 5-45.
- Cardinal, S. , Buchmann, S. L. and Russell, A. L. 2018
- The evolution of floral sonication, a pollen foraging behavior used by bees (Anthophila). Evolution, 72: 590-600. doi:10.1111/evo.13446
- Carvell, C.,et al.. 2016
- Defra project WC1101: Design and Testing of a National Pollinator and Pollination Monitoring Framework: Final Report: A report to the Department for Environment, Food and Rural Affairs (Defra), Scottish Government and Welsh Government, Wallingford, UK, Natural Environment Research Council (Centre for Ecology and Hydrology), p. iii+62. http://randd.defra.gov.uk/.
- Ceballos, G., Dusmet, J.M. and del Junco, J. 1956
- Catálogo de los Himenópteros de España.
- Cederberg, B., Larsson, K. and Nilsson, A. 2010
- Åtgärdsprogram för havsmurarbi 2010–2014 (Osmia maritima). NATURVÅRDSVERKET.
- Celary, W. 1995
- Nomadini (Hymenoptera, Apoidea, Anthophoridae) of Poland, Monographiae Fauny Polski, Tom 20 1995. Krakow
- Celary, W. 1990
- Review of the parasitic bees of the family Anthophoridae (Hymenoptera, Apoidea) in Poland (excluding the genus Nomada Scop.). Pol. Pismo entomol. 60: 9-23.
- Celary, W. 1995
- Nomadini (Hymenoptera, Apoidea, Anthophoridae) of Poland. Monografie Fauny Polski. Wydawnictwa ISEZ PAN, Kraków.
- Celary, W. 2005
- Melittidae of Poland (Hymenoptera: Apoidea: Anthophila) their Biodiversity and Biology. PAS, Krakow
- Celary, W. & Wiśniowski B. 2007
- Contribution to the bee fauna (Hymenoptera: Apoidea: Anthophila) of Poland. Journal of Apicultural Science, Vol. 51 No. 1 pp. 65-71
- Celary, W. and Wisniowski, B. 2009
- Redescription of Andrena stragulata Illiger, 1806 (Hymenoptera: Apoidea: Anthophila: Andrenidae) – the new wild bee species for the Polish fauna. Polskie Pismo Entomologiczne 78 : 369-376.
- Celary, W., and Wiśniowski, B. 2003
- Contribution to the bee fauna (Hymenoptera: Apoidea) of Poland. Acta zoologica cracoviensia 46(4): 359-364.
- Chambers, V.H. 1968
- Pollens collected by species of Andrena (Hymenoptera: Apidae). Proc. R. ent. Soc. London 43(10-12): 155-160.
- Cheeseborough, I.P., Boardman, P.J, and Jones, N.P. 2007
- An invertebrate survey of Prees Heath Nature Reserve. Butterfly Conservation.
- Chifflet, R., Klein, E.K., Lavigne, C., Le Féon, V., Ricroch, A.E., Lecomte, J. and Vaissière, B.E. 2011
- Spatial scale of insect-mediated pollen dispersal in oilseed rape in an open agricultural landscape. . Journal of Applied Ecology 48(3): 689–696.
- Citation: Tomozei, B. 2014
- Andrena marginata. The IUCN Red List of Threatened Species 2014: e.T19199377A21311130. Downloaded on 28 September 2017.
- Clement, S.L. and Rust, R.W. 1975
- The biology of Hoplitis robusta (Hymenoptera: Megachilidae). Entomological News 86: 115-120.
- Cockerell T.D.A. 1922
- New bees from Madeira islands. — Proc. Ent. Soc. Wash. 24 (1): 31-32.
- Cockerell, T.D.A. 1931
- Descriptions and Records of Bees. CXXVII. Annals and Magazine of Natural History 10(7): 344-351.
- Cockerell, T.D.A. 1910
- New and little known bees. Transactions of the American Entomological Society 36:: 199-249.
- Colin Plant Associates. 2015
- Greenwich Ecology Park assessment of potential effects of shading on invertebrate ecology. Report number BS/2962/15, Colin Plant Associates, Bishops Stortford / Ramboll Environ, London, 47 pp.
- Comba, L., and Comba, M. 1991
- Catalogo degli Apoidei laziali. Fragmenta Entomologica 22(Supplemento (1991)): 1-169.
- Comba, M. 2007
- Gli Apoidei del Parco e delle aree adiacenti (Hymenoptera: Colletidae, Andrenidae, Halictidae, Megachilidae, Anthophoridae, Apidae) Artropodi del Parco Nazionale del Vesuvio: Ricerche Preliminari. Conservazione Habitat Invertebrati 4: 365-375.
- Corbet, S. A., H. Chapman, and N. Saville. 1988
- Vibratory pollen collection and flower form: bumble-bees on Actinidia, Symphytum, Borago and Polygonatum. Funct. Ecol. 2:147-155.
- Cresson, E.T. 1878
- [1879?] Descriptions of new North American Hymenoptera in the collection of the American Entomological Society. Transactions of the American Entomological Society 7: 61–136.
- Cross, I. 2017
- Eucera nigrilabris Lepeletier, 1841 is the host of Sphecodes rubripes Spinola, 1838 (Hymenoptera: Aculeata) Ampulex 9 pp 12-14
- Cross, I. & Notton D.G. 2017
- Small-Headed Resin Bee, Heriades rubicola, new to Britain (Hymenoptera: Megachilidae). British Journal of Entomology & Natural History 30:1-6
- Cross, I. & Wood, T.J. 2018
- New data on the Iberian endemic bee genus Flavipanurgus Warncke (Hymenoptera: Apoidea: Andrenidae): Ecological and genomic data reveal a hidden species Zootaxa 0000 (0): 000–000
- Cross, I.C. 2011
- A new pollen record for Osmia bicolor (Schranck). BWARS Newsletter Autumn 2011, p.17