Putri F, Darmayanti N. The Effectiveness of Group Counseling with Assertive Training Techniques in Enhancing Self-Esteem among Adolescents Victimized by Bullying. JES [Internet]. 2025 Sep. 5 [cited 2026 Apr. 27];9(5):3718-30. Available from: https://jes.ejournal.unri.ac.id/index.php/JES/article/view/1096