MLA

Coast, U. S., and United States. Army Map Service Geodetic Survey. Philippine Islands City Plans. Aparri. The Service, 1944. https://collections.library.yale.edu/catalog/15238590.

APA, 6th edition

Coast, U. S., & Geodetic Survey, U. S. A. M. S. (1944). Philippine Islands city plans. Aparri. [Maps]. The Service, https://collections.library.yale.edu/catalog/15238590.