Dewantari, T. et al. 2021. Group Counseling with Assertive Training Techniques to Self Confidence Adolescents. Jurnal Kependidikan: Jurnal Hasil Penelitian dan Kajian Kepustakaan di Bidang Pendidikan, Pengajaran dan Pembelajaran. 7, 1 (Mar. 2021), 35–41. DOI:https://doi.org/10.33394/jk.v7i1.3317.