Roszak, Theodore
Conari Press , 1999
Buku Teks
Carlson, Neil R., author
Allyn and Bacon, [date of publication not identified]
Buku Teks
Carlson, Neil R., author
[publisher not identified], 1997
Buku Teks
Santrock, John W., author
W.C. Brown Publisher, 1991
Buku Referensi
Passer, Michael W
McGraw-Hill, 2007
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