MLA

of Engineers, United States. Army. Corps. Belvedere [Cartographic Material] : City Plan / Prepared under the Direction of the Chief of Engineers, U. S. Army. Army Map Service, U. S. Army, 1943. https://collections.library.yale.edu/catalog/15489267.

APA, 6th edition

of Engineers, U. S. A. C. (1943). Belvedere [cartographic material] : city plan / prepared under the direction of the chief of engineers, U. S. Army. [Maps]. Army Map Service, U. S. Army, https://collections.library.yale.edu/catalog/15489267.