Аполо: Разлика между версии
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Ред 472:
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* „Discussion of Soviet Man-in-Space Shot,“ Hearing before the Committee on Science and Astronautics, U.S. House of Representatives, 87th Congress, First Session, April 13, 1961.
* Hansen, James R. (1999) (PDF). Enchanted Rendezvous: John C. Houbolt and the Genesis of the Lunar-Orbit Rendezvous Concept. NASA.
* French, Francis and Burgess, Colin, In the Shadow of the Moon: A Challenging Journey to Tranquility, 1965–1969. ISBN 978-0-8032-1128-5. History of the Apollo program from Apollo 1–11, including many interviews with the Apollo astronauts.
* Swenson, Jr., Loyd S.; Courtney G Brooks and James M. Grimwood (1979). Chariots for Apollo: A History of Manned Lunar Spacecraft. NASA.
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