Herdiansah, Rian, and Adolf Pieter Lontoh. “Manajemen Pemupukan Tanaman Kelapa Sawit (Elaeis Guineensis Jacq.) Di Kebun Rambutan Sumatera Utara”. Buletin Agrohorti, vol. 6, no. 2, May 2018, pp. 296-04, https://doi.org/10.29244/agrob.v6i2.22529.