Daloz, L. A.
, Daloz, S., Keen, C. H., & Keen, J. P.. Common fire: Lives of commitment in a complex world. Boston: Beacon Press.
2.
Kegan, R.
(1982). The evolving self: Problem and process in human development. Cambridge, MA: Harvard University Press.
3.
Perry, W.
(1981). Cognitive and ethical growth: The making of meaning. In Chickering, A. (Ed.), The modern American college (pp. 76-116). San Francisco: Jossey-Bass.
4.
Wright, R.
(1995, August 28). The evolution of despair, Time, 50-55.