Hayslip, Bert JR., et al. (2006). Developmental Stage Theories. Chapter in:Michel Hersen & Jay C. Thomas (ed): Comprehensive Handbook Of Personality and Psychopathology. Retrieved October 14, 2012 [1][깨진 링크(과거 내용 찾기)]
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Hayslip, Bert JR., et al. (2006). Developmental Stage Theories. Chapter in:Michel Hersen & Jay C. Thomas (ed): Comprehensive Handbook Of Personality and Psychopathology. Retrieved October 14, 2012 [1][깨진 링크(과거 내용 찾기)]