1
by Plato
Alex Catalogue

2
by Plato
Project Gutenberg

3
by Bacon, Francis
Oregon Renascence Editions

4
by Bacon, Francis
Oregon Renascence Editions

5
by Bacon, Francis
Bibliobytes

6
by Aristotle
Alex Catalogue

7
by Aristotle
Alex Catalogue

8
by Toulmin, Stephen Edelston
Cambridge University Press