APA (7th ed.) Citation

United States. Army. Air Corps. (1921). Standard report on Walker radial engine. U.S. GPO.

Chicago Style (17th ed.) Citation

United States. Army. Air Corps. Standard Report on Walker Radial Engine. Washington: U.S. GPO, 1921.

MLA (9th ed.) Citation

United States. Army. Air Corps. Standard Report on Walker Radial Engine. U.S. GPO, 1921.

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