1-The Athenian Constitution
Aristotle
translated by Sir Frederic G. Kenyon
http://etext.library.adelaide.edu.au/a/a8/athenian.html

2-Metaphysics
Aristotle
translated by W. D. Ross
http://etext.library.adelaide.edu.au/a/a8m/

3- Topics
Aristotle
translated by W. A. Pickard–Cambridge
http://etext.library.adelaide.edu.au/a/a8t/

4- Categories
Aristotle
translated by E. M. Edghill
http://etext.library.adelaide.edu.au/a/a8/categori.html

5- The History of Animals
Aristotle
translated by D’Arcy Wentworth Thompson
http://etext.library.adelaide.edu.au/a/a8ha/