Chogyam Trungpa (2010). “The Collected Works of Chogyam Trungpa: Volume One: Born in Tibet; Meditation in Action; Mudra; Selected Writings”, p.298, Shambhala Publications
Siri Engberg, Joan Banach, Robert Motherwell, Walker Art Center (2003). “Robert Motherwell: the Complete Prints 1940-1991: Catalogue Raisonne”, p.21, Hudson Hills
"The Life of St. Teresa of Jesus, of The Order of Our Lady of Carmel" by Teresa of Avila, translated by David Lewis, (Ch. XXV. "Divine Locutions. Discussions on That Subject"), 1904.