MLA

National Geographic Society (U.S.). Cartographic Division. Southwestern United States / compiled and drawn in the Cartographic Division of the National Geographic Society for the National geographic magazine ; James M. Darley, chief cartographer.. BRBL_00506. c1959. https://collections.library.yale.edu/catalog/15811222.

APA, 6th edition

National Geographic Society (U.S.). Cartographic Division. (["BRBL_00506"])(c1959)[Southwestern United States / compiled and drawn in the Cartographic Division of the National Geographic Society for the National geographic magazine ; James M. Darley, chief cartographer.]. https://collections.library.yale.edu/catalog/15811222.