References
         
            Bernstein, Jeremy.  The Reluctant Father of Black Holes.
             Scientific American, 1996.

            Goldsmith, Dohald.  Supernova.
             New York:  St. Martin's Press, 1989.

            Internet Website.  Black Holes and Beyond.
             http://chico.ncsa.uiuc.edu/Cyberia/NumRel/BlackHoles.html, 1997.

            Luminet, J. P.  Black Holes.
             Cambridge University Press, 1992.

            Thorne, Kip.  Black Holes and Time Warps.
             New York: W. W. Norton & Co., 1994.

            CDROM Encyclopedia.  Infopedia 2.0.
             1992-1995 Softkey Multimedia Inc.