Ports of Lübeck and Travemünde.
MLA
of Strategic Services. Research, United States. Office, and Analysis Branch. Ports of Lübeck and Travemünde. OSS, 1944. https://collections.library.yale.edu/catalog/15476472.
APA, 6th edition
of Strategic Services. Research, U. S. O., & Branch, A. (1944). Ports of Lübeck and Travemünde. [Maps]. OSS, https://collections.library.yale.edu/catalog/15476472.