APA (7th ed.) Citation

United States. Department of the Army. (2004). Trinity site, July 16, 1945. [Dept. of the Army].

Chicago Style (17th ed.) Citation

United States. Department of the Army. Trinity Site, July 16, 1945. [Washington, D.C.?]: [Dept. of the Army], 2004.

MLA (9th ed.) Citation

United States. Department of the Army. Trinity Site, July 16, 1945. [Dept. of the Army], 2004.