Prapatpong Upala และ Sorawit Narupiti. (2007) Development of Stated Preference (SP) technique for determining service quality of paratransit. Chulalongkorn University:ม.ป.ท.Prapatpong Upala และ Sorawit Narupiti. 2007. Development of Stated Preference (SP) technique for determining service quality of paratransit. ม.ป.ท.:Chulalongkorn University;Prapatpong Upala และ Sorawit Narupiti. Development of Stated Preference (SP) technique for determining service quality of paratransit. ม.ป.ท.:Chulalongkorn University, 2007. Print.