Tom Butler-Bowdon (2010). “50 Self-Help Classics: 50 Inspirational Books to Transform Your Life from Timeless Sages to Contemporary Gurus”, p.13, Nicholas Brealey Publishing
Tom Butler-Bowdon (2010). “50 Self-Help Classics: 50 Inspirational Books to Transform Your Life from Timeless Sages to Contemporary Gurus”, p.13, Nicholas Brealey Publishing
Tom Butler-Bowdon (2010). “50 Psychology Classics: Who We Are, How We Think, What We Do: Insight and Inspiration from 50 Key Books”, p.20, Nicholas Brealey Publishing
Tom Butler-Bowdon (2010). “50 Spiritual Classics: Timeless Wisdom From 50 Great Books of Inner Discovery, Enlightenment and Purpose”, p.301, Nicholas Brealey Publishing