"Beginnings: A New Perspective: Life Is Not about the Beginning Or the Ending. It is about the Present Moment" by Catherine Zeeb, Xlibris Corporation, (p. 94), May 12, 2010.
Dr. Robert C. Worstell, Dorothea Brande, Claude M. Bristol, Earl Nightingale, Napoleon Hill (2017). “Mindset StackingTM Inspirational Journal VolumeSS01”, p.76, Lulu.com
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.33, e-artnow