MLA

Service, United States. Army Map. Japan Road Map, 1:1,000,000 / Prepared under the Direction of the Chief of Engineers, U.S. Army by the Army Map Service ... Army Map Service, 1945. https://collections.library.yale.edu/catalog/15511597.

APA, 6th edition

Service, U. S. A. M. (1945). Japan road map, 1:1,000,000 / prepared under the direction of the Chief of Engineers, U.S. Army by the Army Map Service ... [Road maps]. Army Map Service, https://collections.library.yale.edu/catalog/15511597.