APA (7th ed.) Citation

United States. Public Roads Administration. (1939). Public roads, a journal of highway research. [s.n.].

Chicago Style (17th ed.) Citation

United States. Public Roads Administration. Public Roads, a Journal of Highway Research. [Washington]: [s.n.], 1939.

MLA (9th ed.) Citation

United States. Public Roads Administration. Public Roads, a Journal of Highway Research. [s.n.], 1939.