United States. War Department. (1921). Regulations for Officers' Reserve Corps, under National Defense Act as amended by Act of Congress approved June 4, 1920. GPO.
Chicago Style (17th ed.) CitationUnited States. War Department. Regulations for Officers' Reserve Corps, Under National Defense Act as Amended by Act of Congress Approved June 4, 1920. [Washington]: GPO, 1921.
MLA (9th ed.) CitationUnited States. War Department. Regulations for Officers' Reserve Corps, Under National Defense Act as Amended by Act of Congress Approved June 4, 1920. GPO, 1921.
Warning: These citations may not always be 100% accurate.