Astafurova, Y. V., & Proshchalykin, M. Y. (2015). Bees of the genus Sphecodes Latreille 1804 of Siberia, with a key to species (Hymenoptera: Apoidea: Halictidae). Zootaxa, 4052(1), 65–95. https://doi.org/10.11646/zootaxa.4052.1.3