MLA

Section, Great Britain. War Office. General Staff. Geographical. Eastern China 1:50,000. Sheet 16/2,200, Peking / Geographical Section, General Staff [Cartographic Material]. Army Map Service, 1945. https://collections.library.yale.edu/catalog/15510607.

APA, 6th edition

Section, G. B. W. O. G. S. G. (1945). Eastern China 1:50,000. Sheet 16/2,200, Peking / Geographical Section, General Staff [cartographic material]. [Topographic maps]. Army Map Service, https://collections.library.yale.edu/catalog/15510607.