Sulistianto, S.Sos., MBA, R.Hario. “Implementasi Diamond Strategy Framework Pada Bimbingan Belajar Primagama”. Journal of Management and Leadership 1, no. 1 (July 9, 2018): 47–56. Accessed June 12, 2025. https://jurnal.tau.ac.id/index.php/jml/article/view/27.