Kanchalar Keeratirawee และ Fuangfa Unob. (2011) Preparation of sewage sludge-based adsorbent for ammonia gas removal. Chulalongkorn University:ม.ป.ท.Kanchalar Keeratirawee และ Fuangfa Unob. 2011. Preparation of sewage sludge-based adsorbent for ammonia gas removal. ม.ป.ท.:Chulalongkorn University;Kanchalar Keeratirawee และ Fuangfa Unob. Preparation of sewage sludge-based adsorbent for ammonia gas removal. ม.ป.ท.:Chulalongkorn University, 2011. Print.