APA (7th ed.) Citation

United States. War Department. Engineer Department. (1939). Historical Sketch of Corps of Engineers, U.S. Army. [s.n.].

Chicago Style (17th ed.) Citation

United States. War Department. Engineer Department. Historical Sketch of Corps of Engineers, U.S. Army. [Washington]: [s.n.], 1939.

MLA (9th ed.) Citation

United States. War Department. Engineer Department. Historical Sketch of Corps of Engineers, U.S. Army. [s.n.], 1939.