APA (7th ed.) Citation

United States. War Department. (1921). Signal Corps: Commercial telephone, telegraph, and electric time service, general. GPO.

Chicago Style (17th ed.) Citation

United States. War Department. Signal Corps: Commercial Telephone, Telegraph, and Electric Time Service, General. [Washington]: GPO, 1921.

MLA (9th ed.) Citation

United States. War Department. Signal Corps: Commercial Telephone, Telegraph, and Electric Time Service, General. GPO, 1921.

Warning: These citations may not always be 100% accurate.