M. Hertos, “Pengaruh Pemberian Pupuk Gambut dan Urea terhadap Pertumbuhan Bibit Kelapa Sawit (Elaeis guineensis Jacq.) Pada Pembibitan Pre-Nursery: The Influence of Peat and Urea Fertilizer on the Growth of Palm Oil Seeds (Elaeis guineensis Jacq.) In Pre-Nursery”, Anterior J, vol. 13, no. 2, pp. 139–147, Jun. 2014.