Reference

N. N. Blagoveshchenskaya (1983): The Study of Wild Bees in Nature and Laboratory. A Textbook for the Special Course. — 79 pp.; [Ru; 11 figs., 2 tabs., 25 refs. Date: 23.XII.1983]. – Ulyanovsk (Ulyanovsk State Pedagogical Institute) – : 13 - 14.