APA (7th ed.) Citation

United States. Department of the Navy. (1925). Change numbers 4: U.S. naval radio operating signals (C.S.P. 417-E). [publisher not identified].

Chicago Style (17th ed.) Citation

United States. Department of the Navy. Change Numbers 4: U.S. Naval Radio Operating Signals (C.S.P. 417-E). [Washington]: [publisher not identified], 1925.

MLA (9th ed.) Citation

United States. Department of the Navy. Change Numbers 4: U.S. Naval Radio Operating Signals (C.S.P. 417-E). [publisher not identified], 1925.