Nasution, M. A., M. Rivani, A. Nasution, R. Amalia, A. Wulandari, R. Fitrah, and Y. Akbar. “Preference Study of Merck in Palm Oil Mill Using Analytical Hierarcy Process”. Jurnal Penelitian Kelapa Sawit, Vol. 29, no. 3, Dec. 2021, pp. 147-58, doi:10.22302/iopri.jur.jpks.v29i3.128.