MLA

Company, Southern Pacific. Map of California : Compiled from Official and Authentic Sources / by the Southern Pacific. The Matthews-Northrup Works, 0AD. https://collections.library.yale.edu/catalog/15952276.

APA, 6th edition

Company, S. P. (0 C.E.). Map of California : compiled from official and authentic sources / by the Southern Pacific. [Maps]. The Matthews-Northrup Works, https://collections.library.yale.edu/catalog/15952276.