MLA

Commission, Wyoming. State Highway. Wyoming Highway Map / by Wyoming State Highway Commission ; Prepared by Rand McNally & Co. The Commission, 1952. https://collections.library.yale.edu/catalog/15818401.

APA, 6th edition

Commission, W. S. H. (1952). Wyoming highway map / by Wyoming State Highway Commission ; prepared by Rand McNally & Co. [Road maps]. The Commission, https://collections.library.yale.edu/catalog/15818401.