Ali, F. binti, and Mohamad Firdaus Omar. “SULPHUR AS ELEMENT AND ITS BEHAVIOR IN COLLOIDAL SYSTEM: A REVIEW”. Chemical and Natural Resources Engineering Journal (Formally Known As Biological and Natural Resources Engineering Journal), vol. 2, no. 2, Dec. 2019, pp. 13-20, doi:10.31436/cnrej.v2i2.41.