“Peranan Pupuk Organik Dan NPK Majemuk Terhadap Pertumbuhan Kelapa Sawit TBM 1 Di Lahan Marginal”. Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy), vol. 43, no. 3, Feb. 2016, pp. 242-9, https://doi.org/10.24831/jai.v43i3.11251.