Dalton, Gene W., Paul H. Thompson and Raymond L. Price , "The Four Stages of Professional Careers — A New Look at Performance by Professionals," Organizational Dynamics, Summer 1977.
2.
Hall, Douglas T., and Francine S. Hall , "What's New in Career Management," Organizational Dynamics, Summer 1976.
3.
Vaillant, George, "How the Best and the Brightest Came of Age," Psychology Today, September 1977.
4.
Gould, Roger, "Adult Life Stages: Growth toward Self-Tolerance," Psychology Today, February 1975.