Natawan Sittipolkul และ Parames Chutima. (2016) Comparative study of crude oil transportation. Chulalongkorn University:ม.ป.ท.Natawan Sittipolkul และ Parames Chutima. 2016. Comparative study of crude oil transportation. ม.ป.ท.:Chulalongkorn University;Natawan Sittipolkul และ Parames Chutima. Comparative study of crude oil transportation. ม.ป.ท.:Chulalongkorn University, 2016. Print.