MLA

Service, United States. Army Map. Balearic Islands [Cartographic Material] : Special Strategic Map / Compiled by the Army Map Service. Army Map Service, 1943. https://collections.library.yale.edu/catalog/15487359.

APA, 6th edition

Service, U. S. A. M. (1943). Balearic islands [cartographic material] : special strategic map / compiled by the Army Map Service. [Maps]. Army Map Service, https://collections.library.yale.edu/catalog/15487359.