M. RIZAL, “RESPON PUPUK HAYATI AGRI SIMBA TERHADAP PERTUMBUHAN BIBIT SAWIT (Elaeis guineensis) DI MAIN NURSERY”, J. Ilm. Pertan., vol. 7, no. 2, pp. 42–49, Feb. 2010, doi: 10.31849/jip.v7i2.1323.