Febrilia, B. R. A., S. Rahayu, and B. D. Korida. “Ordinal Logistic Regression Analysis of Factors Affecting the Length of Student Study”. Jurnal Matematika MANTIK, vol. 5, no. 1, May 2019, pp. 28-34, doi:10.15642/mantik.2019.5.1.28-34.