APA (7th ed.) Citation

Michigan. State Highway Department, Highway Planning Survey (Mich.), & United States. Public Roads Administration. (1940). General highway map [of Michigan counties]. 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 [of Michigan Counties]. [Lansing, Mich.]: State Highway Department, 1940.

MLA (9th ed.) Citation

Michigan. State Highway Department, et al. General Highway Map [of Michigan Counties]. State Highway Department, 1940.