MLA

Keiderling, Gerhard, and Percy Stulz. Berlin 1945-1975. Moskva: Progress, 1976.

APA

Keiderling, G., & Stulz, P. (1976). Berlin 1945-1975. Moskva: Progress.

Chicago

Keiderling, Gerhard., and Percy Stulz. Berlin 1945-1975. Moskva :: Progress,, 1976.