MLA

Section, Great Britain. War Office. General Staff. Geographical. Town Plan of Ravenna [Cartographic Material]. Army Map Service, U.S. Army, 1943. https://collections.library.yale.edu/catalog/15491963.

APA, 6th edition

Section, G. B. W. O. G. S. G. (1943). Town plan of Ravenna [cartographic material]. [Maps]. Army Map Service, U.S. Army, https://collections.library.yale.edu/catalog/15491963.