Y., A., N. N. N.A, and N. J. H. “LAND USE AND CATCHMENT SIZE/SCALE ON THE WATER QUALITY DETERIORATION OF KINTA RIVER, PERAK, MALAYSIA”. Malaysian Journal of Science, vol. 31, no. 2, Dec. 2012, pp. 121-3, doi:10.22452/mjs.vol31no2.4.