MLA

United States. Office of Strategic Services. Reproduction Branch, United States. Office of Strategic Services. Research, and Analysis Branch. Borneo : Administrative Divisions / R & A, OSS. Reproduction Branch, OSS, 1945. https://collections.library.yale.edu/catalog/15238559.

APA, 6th edition

United States. Office of Strategic Services. Reproduction Branch, U. S. O. of S. S. R., & Branch, A. (1945). Borneo : administrative divisions / R & A, OSS. [Maps, Physical maps]. Reproduction Branch, OSS, https://collections.library.yale.edu/catalog/15238559.