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Heppenheimer, T.A. (1997). Countdown: A history of space exploration. New York: John Wiley and Sons, Inc.
The Space Race
Launius, R. D. (1998). Frontiers of space exploration. Westport, Connecticut: Greenwood Press.
The Space Race
NASA. Official Website. "The vision for space exploration." [2]http://www.nasa.gov/externalflash/Anniversary_VisMar/index_noaccess.html. [17 Mar 2005].
Humans upon Mars
Spudis, Paul D. "Humans Should Explore Space." Part of Scientific American Debate on Who Should Explore Space? Robots vs. Humans. April 18, 1999. Reproduced in Encyclopedia Encarta, CD ROM Version, 2003
History of the U.S. Space Program
Brodie S.J. & Biley F.C. (1999) An exploration of the potential benefits of pet-facilitated therapy, Journal of Clinical Nursing, 8(4), 329-337.
Pet Therapy
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