MLA

Company, H. M. Gousha. 1939 Official Road Map, Utah / [Prepared for] Phillips Petroleum Company. H.M. Gousha, 0AD. https://collections.library.yale.edu/catalog/15818506.

APA, 6th edition

Company, H. M. G. (0 C.E.). 1939 official road map, Utah / [prepared for] Phillips Petroleum Company. [Road maps]. H.M. Gousha, https://collections.library.yale.edu/catalog/15818506.