MLA

Company, H. M. Gousha. Official Road Map of California / [Prepared for] Shell. H.M. Gousha, 0AD. https://collections.library.yale.edu/catalog/15821496.

APA, 6th edition

Company, H. M. G. (0 C.E.). Official road map of California / [prepared for] Shell. [Road maps]. H.M. Gousha, https://collections.library.yale.edu/catalog/15821496.