Paul Pearsall (2009). “Last Self-Help Book You'll Ever Need: Repress Your Anger, Think Negatively, be a Good Blamer and Throttle Your Inner Child”, p.45, Basic Books
John Dewey, Jo Ann Boydston, Sidney Hook (2008). “The Middle Works of John Dewey, 1899-1924, Volume 9: 1916, Democracy and Education”, p.244, SIU Press