Morin , J. V., and D. Santi. “STUDI ADSORPSI ION Pb2+ MENGGUNAKAN JERAMI PADI OLAHAN ASAL MANOKWARI”. Jurnal Natural, Vol. 7, no. 1, Apr. 2008, pp. 39 -44, https://jurnalnatural.unipa.ac.id/index.php/jn/article/view/74.