Simanjuntak, Hiskia, and Sudirman Yahya. “Pengelolaan Panen Kelapa Sawit (Elaeis Guineensis Jacq.) Di Afdeling 5 Kebun Tinjowan, Sumatera Utara”. Buletin Agrohorti 6, no. 2 (May 21, 2018): 241–249. Accessed December 28, 2025. https://journal.ipb.ac.id/bulagron/article/view/18817.