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<xml><bibliography><APA>Warangkana Sungsitthisawad และ Somsak Pitaksanurat. (2013) Groundwater Quality Index for Water Supply Production. &lt;i&gt;EnvironmentAsia&lt;/i&gt;, &lt;i&gt;6&lt;/i&gt;(2), p18-23.</APA><Chicago>Warangkana Sungsitthisawad และ Somsak Pitaksanurat. "Groundwater Quality Index for Water Supply Production". EnvironmentAsia  6 (2013):p18-23.</Chicago><MLA>Warangkana Sungsitthisawad และ Somsak Pitaksanurat. Groundwater Quality Index for Water Supply Production. Thai Society of Higher Education Institutes on Environment:ม.ป.ท. 2013.</MLA></bibliography></xml>
