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
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
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
William Walker Atkinson (2016). “THE POWER OF MIND - 17 Books Collection: The Key To Mental Power Development And Efficiency, Thought-Force in Business and Everyday Life, The Power of Concentration, The Inner Consciousness…: Suggestion and Auto-Suggestion + Memory: How to Develop, Train, and Use It, Practical Mental Influence + The Subconscious and the Superconscious Planes of Mind + Self-Healing by Thought Force…”, p.782, e-artnow