Cite

Sumatra (South) special strategic map / compiled by the Army Map Service.

MLA

Service, United States. Army Map. Sumatra (South) Special Strategic Map / Compiled by the Army Map Service. The Service, 0AD. https://collections.library.yale.edu/catalog/15238585.

APA, 6th edition

Service, U. S. A. M. (0 C.E.). Sumatra (South) special strategic map / compiled by the Army Map Service. [Maps]. The Service, https://collections.library.yale.edu/catalog/15238585.