แหล่งอ้างอิง
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Levinson, D. (1986). The seasons of a man's life. New York: Ballantine.
Vaillant, G. (2015). Triumphs of experience. Cambridge, MA: Belknap.
Sheehy, G. (2006). Passages: Predictable crises of adult life. New York: Ballantine.
Taibbi, R. (2017). Doing couple therapy, 2nd ed. New York: Guilford