MLA

of Naval Personnel. Educational Services Section, United States. Bureau. The South China Sea Area. Distributed by Educational Services Section, Bureau of Naval Personnel, Navy Dept., 1944. https://collections.library.yale.edu/catalog/15511919.

APA, 6th edition

of Naval Personnel. Educational Services Section, U. S. B. (1944). The South China Sea area. [Maps]. Distributed by Educational Services Section, Bureau of Naval Personnel, Navy Dept., https://collections.library.yale.edu/catalog/15511919.