“Forecasting Smallholder Oil Palm Yield in Riau Province through the SARIMA Approach”. UNP Journal of Statistics and Data Science 4, no. 1 (Februari 28, 2026): 10–19. Diakses Oktober 3, 2026. https://ujsds.ppj.unp.ac.id/index.php/ujsds/article/view/436.