Chogyam Trungpa (2010). “The Collected Works of Chogyam Trungpa: Volume Eight: Great Eastern Sun; Shambhala; Selected Writings”, p.107, Shambhala Publications
Chogyam Trungpa (2010). “The Collected Works of Chogyam Trungpa: Volume Eight: Great Eastern Sun; Shambhala; Selected Writings”, p.107, Shambhala Publications