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Hawking, Stephen. A Brief History of Time. New York, NY: Bantam Books, 1998.

 

Gribbin, John, and M. White. Stephen Hawking: A Life in Science. New York, NY: Penguin Group, 1993.

 

Natalie Paris, “Hawking to experience zero gravity,” Telegraph (London), April 26, 2007, accessed  November 11, 2013, http://www.telegraph.co.uk/news/worldnews/1549770/Hawking-to-experience-zero-gravity.html.

 

Strathern, Paul. The Big Idea; Hawking and Black Holes. New York, NY: Anchor Books, 1998.

 

“Wmap - Age of the Universe,” last modified December 21, 2012, accessed November 13, 2013, http://map.gsfc.nasa.gov/universe/uni_age.html.