Porteous, Murray
Buku Teks
The British Psychological Society, 2018
Majalah, Jurnal, Buletin
The British Psychological Society, 2018
Majalah, Jurnal, Buletin
Santrock, John W.
McGraw-Hill, 2003
Multimedia
Burton, Lorelle, author
John Wiley & Sons Australia, 2009
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