The Effectiveness of Group Counseling Using the Behavior Contract Technique in Improving Vocational High School Students’ Discipline. Hambaruan: Jurnal Psikologi, Konseling, dan Pendidikan Anak Usia Dini, [S. l.], v. 1, n. 1, p. 16–26, 2026. Disponível em: https://abecen.com/index.php/Hambaruan/article/view/12. Acesso em: 3 jun. 2026.