APA (7th ed.) Citation

Eno, W. P. (1939). The story of highway traffic control, 1899-1939. The Eno foundation for highway traffic control, inc..

Chicago Style (17th ed.) Citation

Eno, William Phelps. The Story of Highway Traffic Control, 1899-1939. [Saugatuck, Conn.]: The Eno foundation for highway traffic control, inc., 1939.

MLA (9th ed.) Citation

Eno, William Phelps. The Story of Highway Traffic Control, 1899-1939. The Eno foundation for highway traffic control, inc., 1939.