• http://www.lehder.com/AU_LP_SidLethbridge.cfm
• http://www.epa.gov/airquality/takingtoxics/sum4.html
• http://www.dtsc.ca.gov/PollutionPrevention/sb14/upload/assessment-polymers-resins-industry.pdf
• http://www.indiamart.com/company/3704264/
• http://www.climatetechnologies.com/pollution.html
• http://www.pca.state.mn.us/index.php/view-document.html?gid=9098
• http://www.mssewb.org/htm/permis_industry.html
• http://www.eworldtradefair.com/ion-exchange-resin-manufacturers-india.html
• http://www.grotal.com/Hyderabad/Ion-Exchange-Resin-Manufacturers-C70/