Ung Meng Hong และ Kasem Choocharukul. (2007) Stated preference analysis of bus service attribustes in Phnom Penh. Chulalongkorn University:ม.ป.ท.Ung Meng Hong และ Kasem Choocharukul. 2007. Stated preference analysis of bus service attribustes in Phnom Penh. ม.ป.ท.:Chulalongkorn University;Ung Meng Hong และ Kasem Choocharukul. Stated preference analysis of bus service attribustes in Phnom Penh. ม.ป.ท.:Chulalongkorn University, 2007. Print.