SinagaF., SopandieD., and SantosaE. “Pengelolaan Pemupukan Kelapa Sawit (Elaeis Guineensis Jacq.) Di Kebun Aek Nabara, Sumatera Utara”. Buletin Agrohorti, Vol. 12, no. 3, Sept. 2024, pp. 366-74, doi:10.29244/agrob.v12i3.51531.