APA (7th ed.) Citation

United States. War Department. (1944). Telephone switchboard operating procedure. U.S. G.P.O..

Chicago Style (17th ed.) Citation

United States. War Department. Telephone Switchboard Operating Procedure. Washington, D.C.: U.S. G.P.O., 1944.

MLA (9th ed.) Citation

United States. War Department. Telephone Switchboard Operating Procedure. U.S. G.P.O., 1944.