“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 74 (11). https://doi.org/10.11113/jt.v74.4877.