Suggested citation of this website:
Short version:
Kuhlmann, M. et al. (co-authors as listed in "Contributors"): Checklist of the Western Palaearctic Bees (Hymenoptera: Apoidea: Anthophila). http://westpalbees.myspecies.info (yyyy/mm/dd).
Full version:
Kuhlmann, M., H.H. Dathe, A.W. Ebmer, † P. Hartmann, D. Michez, A. Müller, S. Patiny, A. Pauly, C. Praz, P. Rasmont, S. Risch, E. Scheuchl, M. Schwarz, M. Terzo, P.H. Williams, (year): Checklist of the Western Palaearctic Bees (Hymenoptera: Apoidea: Anthophila). http://westpalbees.myspecies.info (yyyy/mm/dd).