Dr. Robert C. Worstell, Dorothea Brande, Claude M. Bristol, Earl Nightingale, Napoleon Hill (2017). “Mindset StackingTM Inspirational Journal VolumeSS01”, p.60, Lulu.com
Jack Canfield, Mark Victor Hansen (2012). “Chicken Soup for the Soul in the Classroom Middle School Edition: Grades 6–8: Lesson Plans and Students' Favorite Stories for Reading Comprehension, Writing Skills, Critical Thinking, Character Building”, p.433, Simon and Schuster
Dr. Robert C. Worstell, Dorothea Brande, Claude M. Bristol, Earl Nightingale, Napoleon Hill (2017). “Mindset StackingTM Inspirational Journal VolumeSS01”, p.148, Lulu.com