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

nork Dean G. Pruitt, Helly P. Soetjipto dan Sri Mul
Argitaratua 2011

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

nork Richard Nelson-Jones, Helly P. Soetjipto dan Sri Mul
Argitaratua 2011