MLA

Service, United States. Army Map. Shoka / Prepared under the Direction of the Chief of Engineers by the Army Map Service. Army Map Service, 1945. https://collections.library.yale.edu/catalog/15511681.

APA, 6th edition

Service, U. S. A. M. (1945). Shoka / prepared under the direction of the Chief of Engineers by the Army Map Service. [Maps]. Army Map Service, https://collections.library.yale.edu/catalog/15511681.