Hershey, Paul and Kenneth Blanchard (1977) The Management of Organizational Behavior. (3rd ed.) Englewood Cliffs, N.J.: Prentice-Hall.
Kohlberg, Lawrence (1984) The Psychology of Moral Development. New York: Harper and Row.
McKenna, Mindi and Perry Pugno (2006) Physicians as Leaders, Oxford: Radcliffe Publishing.
Perry, William (1970) Forms of Intellectual and Ethical Development in the College Years: A Scheme. Troy, MO: Holt, Rinehart & Winston.
Sandstrom, Jeannine and Lee Smith (2017) Legacy Leadership: The Leaders Guide to Lasting Greatness (2nd Ed.) Dallas Tx: CoachWorks.