Social Conflict : Escalation, Talemate, and Settlement = Teori Konflik Sosial

Tekijä Dean G. Pruitt, Helly P. Soetjipto dan Sri Mul
Julkaistu 2011

Theory and Pracktise of Counselling and Therapy, Fourth Edition = Teori dan Praktik Konseling dan Terapi

Tekijä Richard Nelson-Jones, Helly P. Soetjipto dan Sri Mul
Julkaistu 2011