Louisa May Alcott (2015). “Annotated Little Women with English Grammar Exercises: by Louisa May Alcott (Author), Robert Powell (Editor)”, p.495, Powell Publications, LLC
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.266, Shambhala Publications