“A STUDY ON THE POTENTIAL OF RIVERBANK FILTRATION FOR THE REMOVAL OF COLOR, IRON, TURBIDITY AND E.COLI IN SUNGAI PERAK, KOTA LAMA KIRI, KUALA KANGSAR, PERAK, MALAYSIA” (2015) Jurnal Teknologi (Sciences & Engineering), 74(11). doi:10.11113/jt.v74.4877.