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
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
William Walker Atkinson (2016). “WILLIAM WALKER ATKINSON Ultimate Collection – 58 Books in One Volume: The Power of Concentration, The Key To Mental Power Development & Efficiency, Thought-Force in Business and Everyday Life, The Secret of Success, Mind Power, Raja Yoga, Self-Healing by Thought Force…”, p.1692, e-artnow
Prentice Mulford (2015). “Thoughts Are Things & The God In You - Connect With The Force Within Yourself: How to Find With Your Inner Power - From one of the New Thought pioneers, author of Your Forces and How to Use Them, Gift of Spirit & The Gift of Understanding”, p.38, e-artnow
Shakti Gawain (2015). “The Shakti Gawain Essentials: 3 Books in 1: Creative Visualization, Living in the Light & Developing Intuition”, p.7, Mango Media Inc.
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