Wallace D. Wattles (2015). “Wallace D. Wattles Ultimate Collection – 10 Books in One Volume: The Science of Getting Rich, The Science of Being Well, The Science of Being Great, How to Get What You Want and more: From one of the New Thought pioneers, author of Making of the Man Who Can or How to Promote Yourself and New Science of Living and Healing or Health Through New Thought and Fasting”, p.38, e-artnow
Jane Roberts, Seth (Spirit), Robert F. Butts (1994). “The Nature of Personal Reality: Specific, Practical Techniques for Solving Everyday Problems and Enriching the Life You Know”, p.436, New World Library
Wallace D. Wattles (2015). “The Science of Wallace D. Wattles: The Science of Being Well, The Science of Getting Rich & The Science of Being Great – Complete Trilogy: From one of the New Thought pioneers, author of How to Promote Yourself, New Science of Living and Healing, Hellfire Harrison, A New Christ, How to Get What You Want and Jesus The Man and His Work”, p.32, e-artnow
Charles F. Haanel, Donald Gordon Carty (2013). “The Master Key System: 2nd Edition: Open the Secret to Health, Wealth and Love, 24 Lesson Workbook”, p.122, Lulu Press, Inc