Nittaya Sanguanngarm และผู้แต่งคนอื่นๆ. (2010) A development of the English tourist guides course using a task-based approach to enhance the oral English communication ability of Chiang Mai Rajabhat University undergraduates. Chulalongkorn University:ม.ป.ท.Nittaya Sanguanngarm และผู้แต่งคนอื่นๆ. 2010. A development of the English tourist guides course using a task-based approach to enhance the oral English communication ability of Chiang Mai Rajabhat University undergraduates. ม.ป.ท.:Chulalongkorn University;Nittaya Sanguanngarm และผู้แต่งคนอื่นๆ. A development of the English tourist guides course using a task-based approach to enhance the oral English communication ability of Chiang Mai Rajabhat University undergraduates. ม.ป.ท.:Chulalongkorn University, 2010. Print.