MLA

Commission, Arkansas. State Highway. Map of the State Highway System of Arkansas / Issued by Arkansas State Highway Commission. State Highway Commission, 1945. https://collections.library.yale.edu/catalog/15814712.

APA, 6th edition

Commission, A. S. H. (1945). Map of the state highway system of Arkansas / issued by Arkansas State Highway Commission. [Road maps]. State Highway Commission, https://collections.library.yale.edu/catalog/15814712.