Andrews, Robert. In The Concise Columbia Dictionary of Quotations quote by Robert Frost. New York: Columbia University Press. 326, 1989.
Bell, Chip R. In Managers as Mentors: Building Partnerships for Learning quote by Aaron Goldman. San Francisco: Berrett-Koehler Publishers. 166, 1996.
Bettelheim, Bruno and Emmy Sylvester. “Milieu Therapy: Indications and Illustrations.” Psychoanalytic Review 36 (1949): 54-68.
Brainyquote.com, s.v. “Lee Iacooca Quotes.” www.brainyquote.com/quotes/ authors/l/lee_iacocca_2.html/ (accessed November 13, 2008).
Brill, A.A., trans. The Basic Writings of Sigmund Freud, Modern Library Edition. New York: Random House USA, Inc., 1995.
Cameron, Gail. In Rose: A Biography of Rose Fitzgerald Kennedy quote by ...