MLA

Section, Great Britain. War Office. General Staff. Geographical. Railways in Western Russia. Army Map Service, U.S. Army, 0AD. https://collections.library.yale.edu/catalog/15475627.

APA, 6th edition

Section, G. B. W. O. G. S. G. (0 C.E.). Railways in western Russia. [Maps]. Army Map Service, U.S. Army, https://collections.library.yale.edu/catalog/15475627.