APA (7th ed.) Citation

United States. Public Roads Administration. (1940). Public roads, a journal of highway research, Sept. 1940. [s.n.].

Chicago Style (17th ed.) Citation

United States. Public Roads Administration. Public Roads, a Journal of Highway Research, Sept. 1940. [Washington]: [s.n.], 1940.

MLA (9th ed.) Citation

United States. Public Roads Administration. Public Roads, a Journal of Highway Research, Sept. 1940. [s.n.], 1940.