MLA

Company, H. M. Gousha. Official Road Map of Oklahoma / [Prepared for] Conoco Travel Bureau. H.M. Gousha, 1936. https://collections.library.yale.edu/catalog/15814901.

APA, 6th edition

Company, H. M. G. (1936). Official road map of Oklahoma / [prepared for] Conoco Travel Bureau. [Road maps]. H.M. Gousha, https://collections.library.yale.edu/catalog/15814901.