Analysis Effectiveness of the Smallholder Oil Palm Rejuvanation Program (PSR) on Palm Oil Farmers in Silangkitang District, South Labuhanbatu Regency. j.sos.ekon.pertan. 2026;21(3):129-144. Accessed August 20, 2026. https://journal.unhas.ac.id/index.php/jsep/article/view/48351