18. Water Environment Partnership Asia. “State of water environmental issues: Groundwater resources.”http://www.wepa-db.net/policies/state/cambodia/groundwater.htm
18. ដៃគូអភិវឌ្ឍន៍បរិស្ថានទឹកអាស៊ី. ប្រទេសដែលមានបញ្ហាបរិស្ថានទឹក. “ធនធានទឹកក្រោមដី”។ http://www.wepa-db.net/policies/state/cambodia/groundwater.htm