Mahdalena and Siti Mutmainah, “Pengaruh Pemberian Pupuk UREA dan Pupuk Kotoran Sapi Terhadap Pertumbuhan Bibit Tanaman Kelapa Sawit (Elaeis guineensis Jacq): Effect of UREA Fertilizer and Cow Manure on the Growth of Oil Palm Seeds (Elaeis guneensis Jacq)”, agri. j. ilmu. pertan., vol. 11, no. 2, pp. 107–110, Jan. 2023.