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”
Chogyam Trungpa (2010). “The Collected Works of Chogyam Trungpa: Volume One: Born in Tibet; Meditation in Action; Mudra; Selected Writings”, p.338, Shambhala Publications