APA (7th ed.) Citation

United States. Army. Air Corps. (1921). Investigation of crushing strength of spruce at varying angles of grain. U.S. GPO.

Chicago Style (17th ed.) Citation

United States. Army. Air Corps. Investigation of Crushing Strength of Spruce at Varying Angles of Grain. Washington: U.S. GPO, 1921.

MLA (9th ed.) Citation

United States. Army. Air Corps. Investigation of Crushing Strength of Spruce at Varying Angles of Grain. U.S. GPO, 1921.

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