"From the National Fruit Collection: Isaac Newton's Tree" . http://www.brogdale.org.uk/image1.php?varietyid=1089 . Retrieved 10 January 2009 .   ^ Newton's alchemical works transcribed and online at Indiana University . Retrieved 11 January 2007. References Ball, W.W. Rouse (1908). A Short Account of the History of Mathematics . New York: Dover. ISBN   0486206300