Kuhlmann, M., and M. Y. Proshchalykin. “New and Remarkable Asian and North African Species of Colletes Latreille (Hymenoptera: Colletidae)”. Zootaxa, vol. 4028, no. 1, Oct. 2015, pp. 81–101, doi:10.11646/zootaxa.4028.1.3.