En
RuAir force
Air force
Aviation in World War II
Aviation in World War II. Leningrad: Acad. publishing house, 1924.
1924
ГПИБ
Air fleet in World War II
Veigelin, K.E.Vozdushny fleet in World War II. Leningrad: [Voen. Herald], 1924.
1924
ГПИБ