Sources

Domski, Mary "Newton, Sir Isaac" World Book Student 2012 8 May 2012 []

Richard S. Westfall "Newton, Sir Isaac" Student Research Center 1994-2012 10 May 2012 [|http://web.ebscohost.com/src/detail?vid=4&hid=24&sid=99095c05-eade-46d5-a2d9-78ccc78f0c02%40sessionmgr12&bdata=JnNpdGU9c3JjLWxpdmU%3d#db=mih&AN=32419204]

Alfred Rupert Hall "Sir Isaac Newton" Microsoft Encarta 1998 11 May 2012 []