Kahar, Arifin. “Analisis Angka Harapan Lama Sekolah Di Indonesia Timur Menggunakan Weighted Least Squares Regression”. Jurnal Matematika "MANTIK" 4, no. 1 (May 11, 2018): 32-41. Accessed November 21, 2018. http://jurnalsaintek.uinsby.ac.id/index.php/mantik/article/view/231.