Hasibuan, M. A. H., Purwanto, E. and Japar, M. (2018) “Effectiveness of Group Counseling Cognitive Behavior Therapy Cognitive Restructuring Technique and Assertive Skill Training to Improve Assertive Behavior Students”, Jurnal Bimbingan Konseling, 7(1), pp. 55-62. doi: 10.15294/jubk.v7i1.22609.