MLA

Company, H. M. Gousha. Cities Service Invites You to Tour South Dakota. H.M. Gousha, 0AD. https://collections.library.yale.edu/catalog/15814762.

APA, 6th edition

Company, H. M. G. (0 C.E.). Cities Service invites you to tour South Dakota. [Road maps]. H.M. Gousha, https://collections.library.yale.edu/catalog/15814762.