"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