1-Early Greek Philosophy
John Burnet

http://plato.evansville.edu/public/burnet

2-A Treatise Concerning the Principles of Human Knowledge

 George Berkeleyhttp://eserver.org/18th/berkeley.txt

3-An Enquiry Concerning Human Understanding

David Humehttp://etext.library.adelaide.edu.au/h/h92e/

4-Laws
Plato
Written 360 B.C.E
Translated by Benjamin Jowett

http://classics.mit.edu/Plato/laws.html

5-Nicomachean Ethics

Aristotle
Written 350 B.C.E
Translated by W. D. Rosshttp://classics.mit.edu/Aristotle/nicomachaen.html