Cope, Oliver M.D.
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Buku Teks SO
Santrock, John W.
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Buku Referensi
Coon, Dennis
Wadsworth , 2001
Buku Teks
Coon, Dennis
MA Cengage Learning, 2016
Buku Teks
Fakultas Psikologi Universitas Pancasila, 2017
Majalah, Jurnal, Buletin