MLA

of Strategic Services. Research, United States. Office, and Analysis Branch. Geography Division. French West Africa Ethnic Groups / Drawn in the Geography Division, O.S.S. The Division, 1942. https://collections.library.yale.edu/catalog/15533545.

APA, 6th edition

of Strategic Services. Research, U. S. O., & Division, A. B. G. (1942). French West Africa ethnic groups / drawn in the Geography Division, O.S.S. [Maps]. The Division, https://collections.library.yale.edu/catalog/15533545.