S. Supriadi and S. Suyantiningsih, “Behavior Contract Group Counseling For Slow Learner Student Motivation: Konseling Kelompok Kontrak Perilaku Pada Motivasi Belajar Siswa Lamban”, acopen, vol. 11, no. 2, p. 10.21070/acopen.11.2026.15159, Aug. 2026.