Sarud Thumniyom และผู้แต่งคนอื่นๆ. (2007) Use of sludge from wastewater treatment plants as adsorbents for removal of heavy metal ions from water. Chulalongkorn University:ม.ป.ท.Sarud Thumniyom และผู้แต่งคนอื่นๆ. 2007. Use of sludge from wastewater treatment plants as adsorbents for removal of heavy metal ions from water. ม.ป.ท.:Chulalongkorn University;Sarud Thumniyom และผู้แต่งคนอื่นๆ. Use of sludge from wastewater treatment plants as adsorbents for removal of heavy metal ions from water. ม.ป.ท.:Chulalongkorn University, 2007. Print.