Yohansyah, Willy Monika, and Iskandar Lubis. “Analisis Produktivitas Kelapa Sawit (Elaeis Guineensis Jacq.) Di PT. Perdana Inti Sawit Perkasa I, Riau”. Buletin Agrohorti 2, no. 1 (February 13, 2014): 125–131. Accessed December 24, 2025. https://journal.ipb.ac.id/bulagron/article/view/8201.