Thanathon Sesuk และ Kasidit Nootong. (2008) Nitrogen treatment in closed-system tilapia cultivation using submerged nitrifying biofilter. Chulalongkorn University:ม.ป.ท.Thanathon Sesuk และ Kasidit Nootong. 2008. Nitrogen treatment in closed-system tilapia cultivation using submerged nitrifying biofilter. ม.ป.ท.:Chulalongkorn University;Thanathon Sesuk และ Kasidit Nootong. Nitrogen treatment in closed-system tilapia cultivation using submerged nitrifying biofilter. ม.ป.ท.:Chulalongkorn University, 2008. Print.