Tolong jelaskan mengenai Sumber tambahan dari Lockheed A-12

Graham, Richard H. SR-71 Revealed: The Inside Story. St. Paul, Minnesota: MBI Publishing Company, 1996. ISBN 978-0-7603-0122-7.

Johnson, C.L. Kelly: More Than My Share of it All. Washington, D.C.: Smithsonian Books, 1985. ISBN 0-87474-491-1.

Lovick, Edward, Jr. Radar Man: A Personal History of Stealth. Bloomington, Indiana: iUniverse, 2010. ISBN 978-1-4502-4802-0.

Merlin, Peter W. From Archangel to Senior Crown: Design and Development of the Blackbird (Library of Flight Series). Reston, Virginia: American Institute of Aeronautics and Astronautics (AIAA), 2008. ISBN 978-1-56347-933-5.

Pedlow, Gregory W. and Donald E. Welzenbach. The Central Intelligence Agency and Overhead Reconnaissance: The U-2 and OXCART Programs, 1954–1974. Washington, D.C.: Central Intelligence Agency, 1992. ISBN 0-7881-8326-5.

Rich, Ben R. and Leo Janos. Skunk Works: A Personal Memoir of My years at Lockheed. New York: Little, Brown and Company, 1994. ISBN 0-316-7433.

Shul, Brian and Sheila Kathleen O'Grady. Sled Driver: Flying the World's Fastest Jet. Marysville, California: Gallery One, 1994. ISBN 0-929823-08-7.

Suhler, Paul A. From RAINBOW to GUSTO: Stealth and the Design of the Lockheed Blackbird (Library of Flight Series). Reston, Virginia: American Institute of Aeronautics and Astronautics (AIAA), 2009. ISBN 978-1-60086-712-5.