MLA

Company, H. M. Gousha. Continental Oil Co. Official Road Map, Wyoming. H.M. Gousha, 0AD. https://collections.library.yale.edu/catalog/15818396.

APA, 6th edition

Company, H. M. G. (0 C.E.). Continental Oil Co. official road map, Wyoming. [Road maps]. H.M. Gousha, https://collections.library.yale.edu/catalog/15818396.