Reference

V. B. Beiko (1998): [Solitary and bumble bees]; p. 158-171, 176-179; [Ru; 15 figs. Date: 24.IV.1998]. – In: ZUBAKIN, V. A. & V. N. TIKHOMIROV (eds.). The Red Data Book of the Moscow Province. Moscow (Argus: Russian University) – .