Jack Canfield, D. D. Watkins (2007). “Jack Canfield's Key to Living the Law of Attraction: A Simple Guide to Creating the Life of Your Dreams”, p.139, Health Communications, Inc.
"Falling short: seven writers reflect on failure" by Diana Athill, Margaret Atwood, Julian Barnes, Anne Enright, Howard Jacobson, Will Self, Lionel Shriver, www.theguardian.com. June 22, 2013.