Chandranupap, P., and P. Chandranupap. “Pulping Of Vetiver Grass With NH4OH-KOH-AQ Mixtures”. ASEAN Journal of Chemical Engineering, Vol. 11, no. 2, Dec. 2011, pp. 37-44, https://jurnal.ugm.ac.id/v3/AJChE/article/view/8089.