MLA

of Strategic Services. Research, United States. Office, and Analysis Branch. Beaches of Normandy - Vierville to Houlgate [Cartographic Material] / Compiled and Drawn in the Branch of Research and Analysis, OSS. Reproduction Branch, OSS, 0AD. https://collections.library.yale.edu/catalog/15483917.

APA, 6th edition

of Strategic Services. Research, U. S. O., & Branch, A. (0 C.E.). Beaches of Normandy - Vierville to Houlgate [cartographic material] / compiled and drawn in the Branch of Research and Analysis, OSS. [Bathymetric maps, Physical maps]. Reproduction Branch, OSS, https://collections.library.yale.edu/catalog/15483917.