How are Socrates, Plato, and Aristotle beliefs different?

Check these writings out:

Socrates, Plato, and Aristotle (http://webspace.ship.edu/cgboer/athenians.html)

Lecture 8: Greek Thought: Socrates, Plato and Aristotle (http://www.historyguide.org/ancient/lecture8b.html)

Greek Philosophy: Aristotle (http://www.wsu.edu/~dee/GREECE/ARIST.HTM)