Carlson, Neil R., author
[publisher not identified], 1997
Buku Teks
Oxford University Press, 2005
Buku Teks
Vasta, Ross, author
John Wiley & Sons, 1999
Buku Teks
Santrock, John W., author
W.C. Brown Publisher, 1991
Buku Referensi
Passer, Michael W
McGraw-Hill, 2007
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