Cite

Spain 1:10,000. San Fernando city plan / prepared under the direction of the Chief of Engineers, U.S. Army [cartographic material].

MLA

Service, United States. Army Map. Spain 1:10,000. San Fernando City Plan / Prepared under the Direction of the Chief of Engineers, U.S. Army [Cartographic Material]. Army Map Service, U.S. Army, 1943. https://collections.library.yale.edu/catalog/15487305.

APA, 6th edition

Service, U. S. A. M. (1943). Spain 1:10,000. San Fernando city plan / prepared under the direction of the Chief of Engineers, U.S. Army [cartographic material]. [Maps]. Army Map Service, U.S. Army, https://collections.library.yale.edu/catalog/15487305.