Humprey, Nicholas
New York Springer-Verlag , 1999
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Ali Nina Liche Seniati
Fakultas Psikologi Universitas Indonesia, 1997
UI - Laporan Penelitian
Blackwell Publishers, 1995
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Santrock, John W.
W.C. Brown Publisher, 1991
Buku Referensi
Passer, Michael W.
McGraw-Hill, 2007
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