Supak Subinnam และ Sripanya Chaiyai. (2010) The effect of pronunciation training on loei Rajabhat University students'speaking skill /. Khon Kaen University,:ม.ป.ท.Supak Subinnam และ Sripanya Chaiyai. 2010. The effect of pronunciation training on loei Rajabhat University students'speaking skill /. ม.ป.ท.:Khon Kaen University,;Supak Subinnam และ Sripanya Chaiyai. The effect of pronunciation training on loei Rajabhat University students'speaking skill /. ม.ป.ท.:Khon Kaen University, 2010. Print.