http://www.projecthalo.com
http://en.wikipedia.org/wiki/Aristotle,
http://www.ucmp.berkeley.edu/history/aristotle.html, http://plato.stanford.edu/entries/aristotle,
http://www-history.mcs.st-and.ac.uk/Mathematicians/Aristotle.html,
http://classics.mit.edu/Browse/browse-Aristotle.html