“Modeling Open Unemployment Rate in West Sumatera Province Using Truncated Spline Regression” (2022) UNP Journal of Statistics and Data Science, 1(1), hlm. 39–44. Tersedia pada: https://ujsds.ppj.unp.ac.id/index.php/ujsds/article/view/3 (Diakses: 6 Oktober 2026).