MLA

Section, Great Britain. War Office. General Staff. Geographical. Town Plan of Casablanca. Army Map Service, U. S. Army, 1942. https://collections.library.yale.edu/catalog/15534050.

APA, 6th edition

Section, G. B. W. O. G. S. G. (1942). Town plan of Casablanca. [Maps]. Army Map Service, U. S. Army, https://collections.library.yale.edu/catalog/15534050.