Brooks, Courtney G.; Grimwood, James M.; Swenson Jr., Loyd S. Chariots for Apollo: A History of Manned Lunar Spacecraft. Washington, D.C. NASA Scientific and Technical Information Branch, 1979.
Cadbury, Deborah. Space Race: The Battle to Rule the Heavens. London. Harper Perennial, 2005.
Cassidy, D. E. ; Davis, C. L.; Skeer, V. H. Preliminary Considerations of Venus Exploration via Manned Flyby. Bellcom, Inc/NASA, 1967.
D’Antonio, Michael. A Ball, A Dog, A Monkey: 1957—The Space Race Begins. New York. Simon & Schuster, 2007.
Day, Dwayne A. Apollo: Secrets and Whispers. The Space Review. December 6, 2010. Retrieved October 22, 2010 from http://www.thespacereview.com/article/1737/1.
—. Black Apollo. The Space Review. November 29, 2010. Retrieved October 21, 2010 from http://www.thespacereview.com/article/1734/1.
DeVincenzi, Donald L.,Bagby, John R. , eds. Orbiting Quarantine Facility: The Antaeus Report. NASA, 1981.
Ertel, Ivan D.; Morse, Mary Louis. The Apollo Spacrcraft: A Chronology. Volume I. NASA Scientific and Technical Information Branch, 1969.
Feldman, M. S.; Ferrara, L. A.; Havenstein, F. L.; Volonte, J. E.; Whipple, P. H. Manned Venus Flyby. Bellcom, Inc./NASA, 1967.
Harvey, Bryan. Soviet and Russian Lunar Exploration. New York/Heidelberg. Springer-Praxis, 2007.
Greensite, Arthur L. Analysis and Design of Space Vehicle Flight Control Systems Volume XVI–Abort. San Diego. NASA, 1969.
Hendrickx, Bart; Vis, Bert. Energia-Buran: The Soviet Space Shuttle. Chichester, UK. Springer/Praxis Publishing, 2007.
Hill, C.N., A Vertical Empire, Second Edition. London. Imperial College Press, 2012.
Johnson, Nicholas L. The Soviet Reach for the Moon: The L-1 and L-3 Manned Lunar Programs and The Story of the N-1 “Moon Rocket”, Second Edition. Cosmos Books, 1995.
Koelle, H.H., ed. Project Horizon, Volume II: Technical Considerations & Plans. US Army, 1959.
Krige, J., Russo, A. ; Sebesta, L. A History of the European Space Agency, 1958 – 1987 (Vol. II – The Story of ESA, 1973 to 1987). Noordwijk, Netherlands. ESA Publications Division, 2000.
Matzenauer, J.O. Lunar Escape Systems, Volume I: Summary Report. Downey, California. North American Rockwell, 1970.
—. Lunar Escape Systems, Volume II: Final Technical Report. Downey, California. North American Rockwell, 1970.
Peebles, Curtis. High Frontier: The U.S. Air Force and the Military Space Program. Washington, D.C. U.S. Government Printing Office, 1997.
Portree, David S.F. Humans to Mars: Fifty Years of Mission Planning 1950-2000. Washington, D.C. NASA History Division, 2001.
—. Mir Hardware Heritage. Houston, Texas. Johnson Space Center, 1995.
Project RAND. Preliminary Design of a World-Circling Spaceship. Santa Monica, California. Douglas Aircraft Corporation, 1946.
Sänger, Eugen; Bredt, Irene (Hamermesh, Morton trans.). A Rocket Drive for Long Range Bombers. Ainring, Germany. Deutsche Luftfahrtforschung, 1944.
Shayler, David J. Space Rescue: Ensuring the Safety of Manned Spacecraft. New York/Heidelberg. Springer-Praxis, 2009.
—. Apollo: The Lost and Forgotten Missions. Chichester, UK/Heidelberg. Springer-Praxis, 2002.
Siddiqi, Assif A. Challenge to Apollo The Soviet Union and the Space Race. Washington, DC. NASA History Division, 2000.
Temple, L. Parker, III. “X-15B: Pursuit of Early Orbital Human Spaceflight”. Air Power History, Spring 2008: pp. 29-41.
Tharratt, C. E. Project SERV: A Space Shuttle Feasibility Study. New Orleans, Louisiana. Chrysler Corporation Space Division, 1969.
— Project SERV Final Review. New Orleans, Louisiana. Chrysler Corporation Space Division, 1971.
Unknown. Direct Flight Apollo Study, Volume II: Gemini Spacecraft Applications. St. Louis, Missouri. McDonnell Aircraft/NASA, 1962.
Unknown. Lunar Expedition Plan: Lunex. Maryland. Air Force Systems Command, 1961.
Unknown. Lunar Surface Mobility Systems Comparison and Evolution (MOBEV): Final Presentation Report. Ann Arbor, Michigan. Bendix Systems Division, 1966.
Unknown. Lunar Surface Mobility Systems Comparison and Evolution (MOBEV): Final Report, Volume II, Book 1: MOLEM. MOCOM, MOCAN, Part I: Technical Report. Ann Arbor, Michigan. Bendix Systems Division, 1966.
Many technical and chronological details are from the website Encyclopedia Astronautica (http://www.astronautix.com), which the author cannot recommend highly enough.
