United States. Army. Signal Corps. (1922). Elements of automatic telephone system. GPO.
Chicago Style (17th ed.) CitationUnited States. Army. Signal Corps. Elements of Automatic Telephone System. [Washington]: GPO, 1922.
MLA (9th ed.) CitationUnited States. Army. Signal Corps. Elements of Automatic Telephone System. GPO, 1922.
Warning: These citations may not always be 100% accurate.