APA (7th ed.) Citation

United States. Interstate Commerce Commission. (1939). Operating Revenues and Operating Expenses of Class I Steam Railways in the United States, Oct. 1939. [s.n.].

Chicago Style (17th ed.) Citation

United States. Interstate Commerce Commission. Operating Revenues and Operating Expenses of Class I Steam Railways in the United States, Oct. 1939. [Washington]: [s.n.], 1939.

MLA (9th ed.) Citation

United States. Interstate Commerce Commission. Operating Revenues and Operating Expenses of Class I Steam Railways in the United States, Oct. 1939. [s.n.], 1939.