Edward Sapir, David Goodman Mandelbaum (1985). “Selected Writings of Edward Sapir in Language, Culture and Personality”, p.111, Univ of California Press
Florence Scovel Shinn (2013). “Your Word is Your Wand: The Secret Edition - Open Your Heart to the Real Power and Magic of Living Faith and Let the Heaven Be in You, Go Deep Inside Yourself and Back, Feel the Crazy and Divine Love and Live for Your Dreams”, p.32, Lulu Press, Inc