Edwin Arnold (2016). “The Light of Asia, or the Great Renunciation (Mahâbhinishkramana): Being the Life and Teaching of Gautama, Prince of India and Founder of Buddhism (as Told in Verse by an Indian Buddhist)”, p.42, Routledge
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”