Manila : PACERS, 2007,
Majalah, Jurnal, Buletin
British Psychological Society, {s.a.}
Majalah, Jurnal, Buletin
Blackwell - The Japan Group dynamics Association, 2007,
Majalah, Jurnal, Buletin
British Psychological Society, 2018
Majalah, Jurnal, Buletin
British Psychological Society, 2018
Majalah, Jurnal, Buletin