Brian Solis (2010). “Engage: The Complete Guide for Brands and Businesses to Build, Cultivate, and Measure Success in the New Web”, p.7, John Wiley & Sons
H. Emilie Cady (2016). “LESSONS IN TRUTH - A Course of Twelve Lessons in Practical Christianity: How to Enhance Your Confidence and Your Inner Power & How to Improve Your Spiritual Development”, p.6, e-artnow
Boris Yeltsin's speech to the summit of the Organization for Security and Co-operation in Europe (OSCE) in Istanbul, news.bbc.co.uk. November 18, 1999.
Wallace D. Wattles (2015). “Wallace D. Wattles Ultimate Collection – 10 Books in One Volume: The Science of Getting Rich, The Science of Being Well, The Science of Being Great, How to Get What You Want and more: From one of the New Thought pioneers, author of Making of the Man Who Can or How to Promote Yourself and New Science of Living and Healing or Health Through New Thought and Fasting”, p.81, e-artnow