“Modeling Open Unemployment Rate in West Sumatera Province Using Truncated Spline Regression”, ujsds, vol. 1, no. 1, hlm. 39–44, Jan 2022, Diakses: Okt 06, 2026. Tersedia pada: https://ujsds.ppj.unp.ac.id/index.php/ujsds/article/view/3