APA (7th ed.) Citation

United States. Army. Signal Corps. (1929). Historical sketch of Signal Corps (1860-1928). [publisher not identified].

Chicago Style (17th ed.) Citation

United States. Army. Signal Corps. Historical Sketch of Signal Corps (1860-1928). [United States]: [publisher not identified], 1929.

MLA (9th ed.) Citation

United States. Army. Signal Corps. Historical Sketch of Signal Corps (1860-1928). [publisher not identified], 1929.

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