62 (April 1989): 337-341.
Handbook for Boys
. New York: Doubleday-Page and Co., 1911
Jones, Beau Fly et al.
Teaching Thinking Skills
. Washington: National Education Association, 1987.
King, Lean and Rita King. "Tactics for Thinking in Action."
Educational Leadership
45 (April 1988): 42-44.
Kohlberg, Lawrence. "Moral Education for a Moral Transition."