Worrachead Somboonna และ Supatra Jinawath. (2007) Characterization of flat sheet cement containing rice husk ash. Chulalongkorn University:ม.ป.ท.Worrachead Somboonna และ Supatra Jinawath. 2007. Characterization of flat sheet cement containing rice husk ash. ม.ป.ท.:Chulalongkorn University;Worrachead Somboonna และ Supatra Jinawath. Characterization of flat sheet cement containing rice husk ash. ม.ป.ท.:Chulalongkorn University, 2007. Print.