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<xml><bibliography><APA>Wanna Phiwkliang และผู้แต่งคนอื่นๆ. (2013) Effect of lewis acid on the activity of ziegler-natta catalyst and the properties of polyethylene. Chulalongkorn University:ม.ป.ท.</APA><Chicago>Wanna Phiwkliang และผู้แต่งคนอื่นๆ. 2013. Effect of lewis acid on the activity of ziegler-natta catalyst and the properties of polyethylene. ม.ป.ท.:Chulalongkorn University;</Chicago><MLA>Wanna Phiwkliang และผู้แต่งคนอื่นๆ.  Effect of lewis acid on the activity of ziegler-natta catalyst and the properties of polyethylene.  ม.ป.ท.:Chulalongkorn University, 2013. Print.</MLA></bibliography></xml>
