APA (7th ed.) Citation

United States. Army. Air Corps. (1921). Extract from report of Bureau of Standards regarding recommendations for filling balloons. U.S. GPO.

Chicago Style (17th ed.) Citation

United States. Army. Air Corps. Extract from Report of Bureau of Standards Regarding Recommendations for Filling Balloons. Washington: U.S. GPO, 1921.

MLA (9th ed.) Citation

United States. Army. Air Corps. Extract from Report of Bureau of Standards Regarding Recommendations for Filling Balloons. U.S. GPO, 1921.