Chogyam Trungpa (2010). “The Collected Works of Chogyam Trungpa: Volume Eight: Great Eastern Sun; Shambhala; Selected Writings”, p.34, Shambhala Publications
Chogyam Trungpa (2010). “The Collected Works of Chogyam Trungpa: Volume Three: Cutting Through Spiritual Materialism; The Myth of Freedom; The Heart of the Bud dha; Selected Writings”, p.8, Shambhala Publications