APA (7th ed.) Citation

United States. National Aeronautics and Space Administration. (1991). Countdown!: NASA launch vehicles and facilities. National Aeronautics and Space Administration.

Chicago Style (17th ed.) Citation

United States. National Aeronautics and Space Administration. Countdown!: NASA Launch Vehicles and Facilities. [Washington, D.C.?]: National Aeronautics and Space Administration, 1991.

MLA (9th ed.) Citation

United States. National Aeronautics and Space Administration. Countdown!: NASA Launch Vehicles and Facilities. National Aeronautics and Space Administration, 1991.