Novriansyah, D., E. Purwanto, and M. E. Wibowo. “The Effectiveness of Solution-Focused Brief Therapy Group Counseling to Improve Students’ Self-Concepts”. Jurnal Bimbingan Konseling, Vol. 8, no. 4, July 2019, pp. 130-6, https://journal.unnes.ac.id/sju/jubk/article/view/31343.