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http://en.wikipedia.org/wiki/Aristotle
Selected TEXTS
Four Causes (Metaph. 5.2)
http://ebooks.adelaide.edu.au/a/aristotle/metaphysics/book5.html
Nature (Metaph 5.4)
First Mover
Metaph 12.6-7 @ adelaide
See also: Thomas on Book XII
http://dhspriory.org/thomas/Metaphysics12.htm
The Five Ways
http://www.newadvent.org/summa/1002.htm#article3
On the Soul (Actuality 2.1; Not separate 2.2)
http://ebooks.adelaide.edu.au/a/aristotle/a8so/book2.html#book2
Ethics
http://nothingistic.org/library/aristotle/nicomachean/index.html)
On Interpretation
http://classics.mit.edu/Aristotle/interpretation.1.1.html