MLA

Commission, Missouri. State Highway. Missouri : 1941 Highway Map / Compliments Missouri State Highway Commission. Missouri State Highway Commission, 0AD. https://collections.library.yale.edu/catalog/15814679.

APA, 6th edition

Commission, M. S. H. (0 C.E.). Missouri : 1941 highway map / compliments Missouri State Highway Commission. [Road maps]. Missouri State Highway Commission, https://collections.library.yale.edu/catalog/15814679.