Glenn R. Schiraldi (2007). “10 Simple Solutions for Building Self-Esteem: How to End Self-Doubt, Gain Confidence, & Create a Positive Self-Image”, p.9, New Harbinger Publications
Nathaniel Branden (2001). “The Psychology of Self-Esteem: A Revolutionary Approach to Self-Understanding that Launched a New Era in Modern Psychology”, Jossey-Bass
Letter to "Weird Tales" editor Edwin Baird, printed in "Weird Tales" 3, no. 3 (March 1924); Quoted in "Lord of a Visible World: An Autobiography in Letters" edited by S. T. Joshi, (p. 122), 2000.