Catherine Helen Spence, Susan Magarey, Maryan Beams (2005). “Ever Yours, C.H. Spence: Catherine Helen Spence's An Autobiography (1825-1910), Diary (1894) and Some Correspondence (1894-1910)”, p.40, Wakefield Press
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”