MLA

Company, H. M. Gousha. Street Map of San Francisco. H.M. Gousha, 0AD. https://collections.library.yale.edu/catalog/15818770.

APA, 6th edition

Company, H. M. G. (0 C.E.). Street map of San Francisco. [Maps]. H.M. Gousha, https://collections.library.yale.edu/catalog/15818770.