APA (7th ed.) Citation

United States. Army. Signal Corps. (1931). General service code, information and practice material. [publisher not identified].

Chicago Style (17th ed.) Citation

United States. Army. Signal Corps. General Service Code, Information and Practice Material. [United States]: [publisher not identified], 1931.

MLA (9th ed.) Citation

United States. Army. Signal Corps. General Service Code, Information and Practice Material. [publisher not identified], 1931.

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