APA (7th ed.) Citation

United States. War Plans Division. (1917). Note on listening apparatus for aircraft, made by Military Telegraph Service. U.S. GPO.

Chicago Style (17th ed.) Citation

United States. War Plans Division. Note on Listening Apparatus for Aircraft, Made by Military Telegraph Service. Washington: U.S. GPO, 1917.

MLA (9th ed.) Citation

United States. War Plans Division. Note on Listening Apparatus for Aircraft, Made by Military Telegraph Service. U.S. GPO, 1917.