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

od Dean G. Pruitt, Helly P. Soetjipto dan Sri Mul
Wydane 2011

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

od Richard Nelson-Jones, Helly P. Soetjipto dan Sri Mul
Wydane 2011