“ASSESSMENT OF WATER QUALITY AND HEAVY METAL CONTAMINATION (ALUMINUM, IRON, COPPER, CADMIUM, LEAD, AND ZINC) IN TERENGGANU, SETIU AND BESUT RIVERS, MALAYSIA” (2026) Jurnal Teknologi (Sciences & Engineering), 88(4), pp. 761–772. doi:10.11113/jurnalteknologi.v88.24719.