Reference

V. B. Beiko, L. B. Volkova, N. A. Sobolev (1998): Xylocopa valga; [Ru; 1 fig., 6 refs. Date: 24.IV.1998]. – In: ZUBAKIN, V. A. & V. N. TIKHOMIROV (eds.). The Red Data Book of the Moscow Province. Moscow (Argus: Russian University) – : 166 - 167.