MLA

of Southern California, Automobile Club. Imperial County / Copyright by Automobile Club of Southern California. The Club, 0AD. https://collections.library.yale.edu/catalog/15821506.

APA, 6th edition

of Southern California, A. C. (0 C.E.). Imperial County / copyright by Automobile Club of Southern California. [Maps]. The Club, https://collections.library.yale.edu/catalog/15821506.