Socrates, Plato, Aristotle (1967). “Wit and Wisdom of Socrates, Plato, Aristotle: Being a Treasury of Thousands of Glorious, Inspiring and Imperishable Thoughts, Views and Observations of the Three Great Greek Philosophers, Classified Under about Four Hundred Subjects for Comparative Study”
Dannion Brinkley, Paul Perry (2009). “Saved by the Light: The True Story of a Man Who Died Twice and the Profound Revelations He Received”, p.20, Harper Collins