1. Plato’s Dialogues of Definition
2. ‘The Unity of Virtue’;Penner;Philosophical Review,1973
3. ‘Socrates on the Impossibility of Belief Relative Science’;Penner,1988
4. ‘Power and Desire in Socrates: the Argument of Gorgias 466a-466e that Orators and Tyrants have no Power in the City’;Penner,1991