Lawrence G. Lovasik (1999). “The Hidden Power of Kindness: A Practical Handbook for Souls who Dare to Transform the World, One Deed at a Time”, p.50, Sophia Institute Press
Thorstein Veblen (2016). “THORSTEIN VEBLEN Ultimate Collection: 8 Books & 50+ Business Essays and Articles in Warfare and Economics: The Theory of the Leisure Class, The Theory of Business Enterprise, The Higher Learning In America, Panem et Circenses, The Vested Interests and the Common Man, The Use of Loan Credit in Business…”, p.16, e-artnow