Pham Ngoc Ho. (2012) Total Water Quality Index Using Weighting Factors and Standardized into a Parameter. <i>EnvironmentAsia</i>, <i>5</i>(2), p63-69.Pham Ngoc Ho. "Total Water Quality Index Using Weighting Factors and Standardized into a Parameter". EnvironmentAsia 5 (2012):p63-69.Pham Ngoc Ho. Total Water Quality Index Using Weighting Factors and Standardized into a Parameter. Thai Society of Higher Education Institutes on Environment:ม.ป.ท. 2012.