Proshchalykin, Maxim Yu., and Michael Kuhlmann. “The Bees of the Genus Colletes Latreille 1802 of the Ukraine, With a Key to Species (Hymenoptera: Apoidea: Colletidae)”. Zootaxa 3488, no. 1 (September 18, 2012): 1–40. Accessed April 20, 2025. https://mapress.com/zt/article/view/zootaxa.3488.1.1.