MLA

Dept, Great Britain. Inter-service Topographical. Concarneau [Cartographic Material] : Plan of Port and Town / Compiles & Drawn by Inter-Service Topographical Dept. Army Map Service, U.S. Army, 1944. https://collections.library.yale.edu/catalog/15484357.

APA, 6th edition

Dept, G. B. I.-service T. (1944). Concarneau [cartographic material] : plan of port and town / compiles & drawn by Inter-service Topographical Dept. [Maps]. Army Map Service, U.S. Army, https://collections.library.yale.edu/catalog/15484357.