Piyavit Pokasermsong และ Piyasan Praserthdam. (2008) Comparative study of Ziegler-Natta catalyst synthesis for ethylene polymerization. Chulalongkorn University:ม.ป.ท.Piyavit Pokasermsong และ Piyasan Praserthdam. 2008. Comparative study of Ziegler-Natta catalyst synthesis for ethylene polymerization. ม.ป.ท.:Chulalongkorn University;Piyavit Pokasermsong และ Piyasan Praserthdam. Comparative study of Ziegler-Natta catalyst synthesis for ethylene polymerization. ม.ป.ท.:Chulalongkorn University, 2008. Print.