SantosaE., StefanoI. M., Gani TariganA. G., WachjarA., ZamanS., and Agusta and H. “Tree-Based Water Footprint Assessment on Established Oil Palm Plantation in North Sumatera, Indonesia”. Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy), Vol. 46, no. 1, Apr. 2018, pp. 111-8, doi:10.24831/jai.v46i1.13665.