Sonita SUM และผู้แต่งคนอื่นๆ. (2020) Measuring the city bus service quality based on users' perceptions: City bus service in Phnom Penh, Cambodia. <i>Engineering and Applied Science Research</i>, <i>47</i>(1), 47-55.Sonita SUM และผู้แต่งคนอื่นๆ. "Measuring the city bus service quality based on users' perceptions: City bus service in Phnom Penh, Cambodia". Engineering and Applied Science Research 47 (2020):47-55.Sonita SUM และผู้แต่งคนอื่นๆ. Measuring the city bus service quality based on users' perceptions: City bus service in Phnom Penh, Cambodia. Faculty of Engineering, Khon Kaen University:ม.ป.ท. 2020.