MLA

of Strategic Services. Research, United States. Office, and Analysis Branch. "Greater" Germany, Population Dependent upon Commercial and Service Occupations (by Kreise 1939). R & A, OSS, 1945. https://collections.library.yale.edu/catalog/15479623.

APA, 6th edition

of Strategic Services. Research, U. S. O., & Branch, A. (1945). "Greater" Germany, population dependent upon commercial and service occupations (by Kreise 1939). [Maps]. R & A, OSS, https://collections.library.yale.edu/catalog/15479623.