©2013 National Research Council of Thailand
Wilawan Phuwichai. 2007. The development of a conversation package for operators in Khon Kaen University. Field of Study English, Khon Kaen University;
Wilawan Phuwichai. (2007) The development of a conversation package for operators in Khon Kaen University . Khon Kaen University/Khon Kaen.
Wilawan Phuwichai. The development of a conversation package for operators in Khon Kaen University. . Khon Kaen:Khon Kaen University, 2007.
Wilawan Phuwichai. (2007) The development of a conversation package for operators in Khon Kaen University . Khon Kaen University/Khon Kaen.