MLA

National Geographic Society (U.S.). Cartographic Section. Southwestern United States / compiled and drawn in the Cartographic Section of the National Geographic Society ; James M. Darley, chief cartographer ; compilation by H.C. Bryan, R.W. Collins, R.J. Darley, A.D. Grazzini, and A.E. Holdstock ; relief by John. BRBL_00506. 1948. https://collections.library.yale.edu/catalog/15811221.

APA, 6th edition

National Geographic Society (U.S.). Cartographic Section. (["BRBL_00506"])(1948)[Southwestern United States / compiled and drawn in the Cartographic Section of the National Geographic Society ; James M. Darley, chief cartographer ; compilation by H.C. Bryan, R.W. Collins, R.J. Darley, A.D. Grazzini, and A.E. Holdstock ; relief by John]. https://collections.library.yale.edu/catalog/15811221.