APA (7th ed.) Citation

Michigan. State Highway Department, Highway Planning Survey (Mich.), & United States. Public Roads Administration. (1940). General highway map, St. Clair County. State Highway Department.

Chicago Style (17th ed.) Citation

Michigan. State Highway Department, Highway Planning Survey (Mich.), and United States. Public Roads Administration. General Highway Map, St. Clair County. [Lansing]: State Highway Department, 1940.

MLA (9th ed.) Citation

Michigan. State Highway Department, et al. General Highway Map, St. Clair County. State Highway Department, 1940.