Sukarti, Sri, Kusnarto Kurniawan, and Mulawarman Mulawarman. 2018. “Mengurangi Bullying Verbal Melalui Konseling Kelompok Dengan Teknik Kontrak Perilaku”. Indonesian Journal of Guidance and Counseling: Theory and Application 7 (1). https://doi.org/10.15294/ijgc.v7i1.18263.