Thinkquest Citations and References
Coleman, James A.. relativity for the layman. New York: The William-Frederick Press, 1958
Strathern, Paul. The Big idea: Hawking and Black Holes. New York: Doubleday Dell Publishing, 1997
Pickover, Clifford A.. Black Holes: A Traveller's Guide. New York: John Wiley & Sons, Inc. , 1996
Hey, Tony. "Einstein's Mirror". Cambridge: Cambridge University Press, 1997, pp. 1-87 210-227
SCIAM. Scientific American: Ask the Experts: Physics http://www.sciam.com/askexpert/physics/physics18.html. Last visited: June, 2001.
Steve Preston. Time Travel http://freespace.virgin.net/steve.preston/time1.html. Last visited: June, 2001.
John Gribbin. Time Travel for Beginners http://www.biols.susx.ac.uk/home/John_Gribbin/Time_Travel.html. last visited: June, 2001.