Sukmawan, Y., and D. Riniarti. “Growth Response of Oil Palm Seedlings to Empty Fruit Bunch Mulching and Watering Frequency Adjustment”. Jurnal Penelitian Kelapa Sawit, Vol. 28, no. 3, Dec. 2020, pp. 159-68, doi:10.22302/iopri.jur.jpks.v28i3.121.