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*{{chú thích sách |ref=harv |last1=Zastrow |first1=Charles |authorlink1=Charles Zastrow |last2=Kirst-Ashman |first2=Karen |year=2009 |title=Understanding Human Behavior and the Social Environment |publisher=Cengage Learning |isbn=978-0-495-60374-0 }}
*|Erik H. Erikson, Joan M. Erikson, The Life Cycle Completed: Extended Version (W. W. Norton, 1998),
