Putri, Erlaningtias, Ratnasari, Dwi Fungky, Harumsari, Anugerah Dewi, Lestari, Vivid Ayu, AND Wardhani, Sri. " Utilization of Sludge from Sidoarjo for Synthesis of Microball Photocatalist of Fe2O3 zeolit-chitosan as Fermented Soybean Waste-Degrading Agent" Jurnal ILMU DASAR [Online], Volume 17 Number 2 (1 February 2017)