Carlson, Neil R.
Allyn and Bacon , 1997
Buku Teks SO
Vasta, Ross
John Wiley & Sons, 1999
Buku Teks SO
Santrock, John W.
W.C. Brown Publisher, 1991
Buku Referensi
Passer, Michael W.
McGraw-Hill, 2007
Buku Teks SO
Passer, Michael W.
McGraw-Hill, 2007
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