Proshchalykin, M. Y. and Kuhlmann, M. (2012) “The bees of the genus Colletes Latreille 1802 of the Ukraine, with a key to species (Hymenoptera: Apoidea: Colletidae)”, Zootaxa. Auckland, New Zealand, 3488(1), pp. 1–40. doi: 10.11646/zootaxa.3488.1.1.