Cite

Iceland 1:500,000.

MLA

Great Britain. War Office, United States. Army Map Service. Iceland 1:500,000. Army Map Service, U.S. Army,, War Office ; 1941. https://collections.library.yale.edu/catalog/15471522.

APA, 6th edition

Great Britain. War Office, U. S. A. M. S. (1941). Iceland 1:500,000. [Maps]. Army Map Service, U.S. Army,, War Office ; https://collections.library.yale.edu/catalog/15471522.