APA (7th ed.) Citation

United States. War Department. (1930). Signal Corps: Telephone switchboard, type BD-14. GPO.

Chicago Style (17th ed.) Citation

United States. War Department. Signal Corps: Telephone Switchboard, Type BD-14. [Washington]: GPO, 1930.

MLA (9th ed.) Citation

United States. War Department. Signal Corps: Telephone Switchboard, Type BD-14. GPO, 1930.

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