Global Health and Education Foundation (2007). "Conventional Coagulation-Flocculation-Sedimentation". Safe Drinking Water is Essential. National Academy of Sciences. मूल से 7 अक्तूबर 2007 को पुरालेखित. अभिगमन तिथि 2007-12-01.
Global Health and Education Foundation (2007). "Conventional Coagulation-Flocculation-Sedimentation". Safe Drinking Water is Essential. National Academy of Sciences. मूल से 7 अक्तूबर 2007 को पुरालेखित. अभिगमन तिथि 2007-12-01.