APA (7th ed.) Citation

National Computer Security Center (U.S.) & Hammer, T. (1989). Rating maintenance phase: Program document. The Center.

Chicago Style (17th ed.) Citation

National Computer Security Center (U.S.) and Tommy Hammer. Rating Maintenance Phase: Program Document. [Fort George G. Meade, Md.]: The Center, 1989.

MLA (8th ed.) Citation

National Computer Security Center (U.S.) and Tommy Hammer. Rating Maintenance Phase: Program Document. The Center, 1989.