Kornrawee Wongsirilert. และ Puree Sirasoontorn. (2010) Efficiency measurement of bus service operators in Bangkok. Thammasat University:ม.ป.ท.Kornrawee Wongsirilert. และ Puree Sirasoontorn. 2010. Efficiency measurement of bus service operators in Bangkok. ม.ป.ท.:Thammasat University;Kornrawee Wongsirilert. และ Puree Sirasoontorn. Efficiency measurement of bus service operators in Bangkok. ม.ป.ท.:Thammasat University, 2010. Print.