Kimcheang Hong และผู้แต่งคนอื่นๆ. (2009) Effects of media-based instruction in English for junior tour guides on speaking ability of students at Kampong Chheuteal High School, Kingdom of Cambodia. Chulalongkorn University:ม.ป.ท.Kimcheang Hong และผู้แต่งคนอื่นๆ. 2009. Effects of media-based instruction in English for junior tour guides on speaking ability of students at Kampong Chheuteal High School, Kingdom of Cambodia. ม.ป.ท.:Chulalongkorn University;Kimcheang Hong และผู้แต่งคนอื่นๆ. Effects of media-based instruction in English for junior tour guides on speaking ability of students at Kampong Chheuteal High School, Kingdom of Cambodia. ม.ป.ท.:Chulalongkorn University, 2009. Print.