MLA

of Strategic Services. Research, United States. Office, and Analysis Branch. Austria [Cartographic Material] : Federal Roads 1937. Lithographed in the Reproduction Branch, OSS, 1944. https://collections.library.yale.edu/catalog/15497840.

APA, 6th edition

of Strategic Services. Research, U. S. O., & Branch, A. (1944). Austria [cartographic material] : Federal roads 1937. [Maps]. Lithographed in the Reproduction Branch, OSS, https://collections.library.yale.edu/catalog/15497840.