MLA

of Strategic Services. Research, United States. Office, and Analysis Branch. Southeast Asia [Cartographic Material] / Compiled and Drawn in the Branch of Research and Analysis, OSS. Branch of Research and Analysis, OSS, 1944. https://collections.library.yale.edu/catalog/15509724.

APA, 6th edition

of Strategic Services. Research, U. S. O., & Branch, A. (1944). Southeast Asia [cartographic material] / compiled and drawn in the Branch of Research and Analysis, OSS. [Physical maps]. Branch of Research and Analysis, OSS, https://collections.library.yale.edu/catalog/15509724.