MLA

Section, Great Britain. War Office. General Staff. Geographical. Ch'in-Wang-Tao & Pei-Tai-Ho [Cartographic Material]. Army Map Service, U.S. Army, 1945. https://collections.library.yale.edu/catalog/15510598.

APA, 6th edition

Section, G. B. W. O. G. S. G. (1945). Ch'in-wang-tao & Pei-tai-ho [cartographic material]. [Maps]. Army Map Service, U.S. Army, https://collections.library.yale.edu/catalog/15510598.