Chogyam Trungpa (2010). “The Collected Works of Chogyam Trungpa: Volume One: Born in Tibet; Meditation in Action; Mudra; Selected Writings”, p.309, Shambhala Publications
Stephen Arroyo, Jerilynn Marshall (1989). “Chart Interpretation Handbook: Guidelines for Understanding the Essentials of the Birth Chart”, p.36, Dubois Publishing