United States. Army. Air Corps. (1921). Service instructions for balloon liaison officers in course of attack. U.S. GPO.
Chicago Style (17th ed.) CitationUnited States. Army. Air Corps. Service Instructions for Balloon Liaison Officers in Course of Attack. Washington: U.S. GPO, 1921.
MLA (9th ed.) CitationUnited States. Army. Air Corps. Service Instructions for Balloon Liaison Officers in Course of Attack. U.S. GPO, 1921.
Warning: These citations may not always be 100% accurate.