Fulton J. Sheen (2009). “God and Intelligence in Modern Philosophy: A Critical Study in the Light of the Philosophy of Saint Thomas”, p.1, Wipf and Stock Publishers
Shakti Gawain (2015). “The Shakti Gawain Essentials: 3 Books in 1: Creative Visualization, Living in the Light & Developing Intuition”, p.13, Mango Media Inc.