MLA

of Strategic Services. Research, United States. Office, and Analysis Branch. China, Terrain and Transportation [Cartographic Material] / Compiled and Drawn in the Branch of Research and Analysis, OSS. OSS Research and Analysis Branch, 1944. https://collections.library.yale.edu/catalog/15510616.

APA, 6th edition

of Strategic Services. Research, U. S. O., & Branch, A. (1944). China, terrain and transportation [cartographic material] / compiled and drawn in the Branch of Research and Analysis, OSS. [Topographic maps]. OSS Research and Analysis Branch, https://collections.library.yale.edu/catalog/15510616.