MLA

Dept, Great Britain. Inter-service Topographical. Brest [Cartographic Material] : Plan of Port and Town / Compiled and Drawn by Inter-Service Topographical Dept. Army Map Service, U.S. Army, 1943. https://collections.library.yale.edu/catalog/15484348.

APA, 6th edition

Dept, G. B. I.-service T. (1943). Brest [cartographic material] : plan of port and town / compiled and drawn by Inter-service Topographical Dept. [Maps]. Army Map Service, U.S. Army, https://collections.library.yale.edu/catalog/15484348.