1. Ascher J.S., J. Pickering. (2019) Discover Life bee species guide and world checklist (Hymenoptera: Apoidea: Anthophila) [online] https://www.discoverlife.org/20/q?search=Apoidea (accessed on 15 March 2020).
2. Ashmole N.P., M.J. Ashmole. (1988) Insect Dispersal on Tenerife, Canary Islands: high altitude fallout and seaward drift. Arctic and Alpine Research 20, 1–12.
3. Balzan M.V., P. Rasmont, M. Kuhlmann, H. Dathe, A. Pauly, et al. (2016) The bees (Hymenoptera: Apoidea) of the Maltese Islands. Zootaxa 4162, 225–244.
4. Batra S.W. (1984) Solitary bees. Scientific American 250, 120–127.
5. Cane J.H. (2003) Exotic non-social bees (Hymenoptera: Apoidea) in North America: ecological implications, in: Strickler K.L. and Cane J.H. (Eds.), For Non-Native Crops, Whence Pollinators of the Future?, Thomas Say Publications, Entomological Society of America, Lanham, Maryland, pp. 113–126.