Opening Up Quotes
Nikola Tesla, Neil Thomas (2017). “Nikola Tesla: 100 Quotes on Innovation, Entrepreneurship, and Success”, Createspace Independent Publishing Platform
Harlan Cleveland (1985). “The knowledge executive: leadership in an information society”, E P Dutton
Sean Stephenson (2009). “Get Off Your "But": How to End Self-Sabotage and Stand Up for Yourself”, p.128, John Wiley and Sons
Eckhart Tolle (2010). “The Power of Now: A Guide to Spiritual Enlightenment”, p.136, New World Library
John D. Rockefeller (2003). “Random Reminiscences of Men and Events”, p.144, The Minerva Group, Inc.
"The Complete Christian Mystic: A Practical, Step - By - Step Guide for Awakening to the Presence of God".