MLA

Forces, Great Britain. Army. Middle East. Derna, City Plan. Army Map Service, U.S. Army, 1943. https://collections.library.yale.edu/catalog/15534108.

APA, 6th edition

Forces, G. B. A. M. E. (1943). Derna, city plan. [Maps]. Army Map Service, U.S. Army, https://collections.library.yale.edu/catalog/15534108.