MLA

Company, Southern Pacific. Map of California / Compiled from Latest, Official & Authentic Information, by the Southern Pacific Company. Southern Pacific, 0AD. https://collections.library.yale.edu/catalog/15821545.

APA, 6th edition

Company, S. P. (0 C.E.). Map of California / compiled from latest, official & authentic information, by the Southern Pacific Company. [Maps]. Southern Pacific, https://collections.library.yale.edu/catalog/15821545.