SimanjuntakH. and YahyaS. (2018) “Pengelolaan Panen Kelapa Sawit (Elaeis Guineensis Jacq.) di Afdeling 5 Kebun Tinjowan, Sumatera Utara”, Buletin Agrohorti, 6(2), pp. 241-249. doi: 10.29244/agrob.v6i2.18817.