Tambunan, Elsass Riela, et al. “Manajemen Pemupukan Kelapa Sawit (Elaeis Guineensis Jacq.) Di Labuhanbatu, Sumatera Utara”. Buletin Agrohorti, vol. 12, no. 1, Jan. 2024, pp. 80-88, https://doi.org/10.29244/agrob.v12i1.51535.