• Environmental & Chemistry Analysis Lecture Notes
• http://www.asiaone.com/News/Education/Story/A1Story20080711-76164.html
• http://www.britannica.com/EBchecked/topic/424285/ocean/67070/Dissolved-organic-substances#tab=active~checked%2Citems~checked&title=ocean%20%3A%3A%20Dissolved%20organic%20substances%20--%20Britannica%20Online%20Encyclopedia
• http://www.hc-sc.gc.ca/ewh-semt/pubs/water-eau/nitrate_nitrite/index-eng.php
• http://www.ktf-split.hr/glossary/en_o.php?def=dissolved%20substance
• http://www.britannica.com/EBchecked/topic/424285/ocean/67070/Dissolved-organic-substances#tab=active~checked%2Citems~checked&title=ocean%20%3A%3A%20Dissolved%20organic%20substances%20--%20Britannica%20Online%20Encyclopedia
• http://gardening.about.com/od/amendingsoil/g/Organic_Matter.htm
• http://www.pub.gov.sg/general/Pages/WaterTreatment.aspx
• www.dictionary.com
• Douglas Bowman - Blogskin
• Tan Wei Hao – for site map
• Cheryl - for being our unpaid model :)