MLA

of Strategic Services. Research, United States. Office, and Analysis Branch. Terrain Regions of Central Europe / Compiled and Drawn in the Branch of Research and Analysis, OSS. Reproduction Branch OSS, 1943. https://collections.library.yale.edu/catalog/15259111.

APA, 6th edition

of Strategic Services. Research, U. S. O., & Branch, A. (1943). Terrain regions of Central Europe / compiled and drawn in the Branch of Research and Analysis, OSS. [Maps]. Reproduction Branch OSS, https://collections.library.yale.edu/catalog/15259111.