References
http://lucidcafe.com/library/95dec/newton.html
www.bbc.co.uk/history/historic_figures/newton_isaac.shtml
www.newton.cam.ac.uk/newtlife.html
http://encarta.msn.com/encnet/features/home.asp
http://csep10.phys.utk.edu/astr161/lect/history/newtongrav.html
www.top-biography.com/0016-Isaac%20Newton/achievement1.htm
www.blupete.com/Literature/Biographies/Science/Newton.htm
www.bartleby.com/65/ne/Newton-S.html
"Newton, Sir Isaac."
Encyclopaedia
Britannica. 2003. Encyclopaedia Britannica Online. 14 Apr,
2003. http://search.eb.com/eb/article?eu=115657.
Physics: for Scientists and
Engineers. Thomson Learning Inc., 2000.