Chogyam Trungpa (2010). “The Collected Works of Chogyam Trungpa: Volume Two: The Path Is the Goal; Training the Mind; Glimpses of Abhidharma; Glimpses of Shu nyata; Glimpses of Mahayana; Selected Writings”, p.179, Shambhala Publications
Jack Canfield, Kelly Johnson, Ram Ganglani (2017). “Success Affirmations: 52 Weeks for Living a Passionate and Purposeful Life”, p.119, Health Communications, Inc.