Chiba Masahito และผู้แต่งคนอื่นๆ. (2009) A survey of Thai learner's problems with Japanese pronunciation and native teachers' perspectives about pronunciation teaching. Siam University:ม.ป.ท.Chiba Masahito และผู้แต่งคนอื่นๆ. 2009. A survey of Thai learner's problems with Japanese pronunciation and native teachers' perspectives about pronunciation teaching. ม.ป.ท.:Siam University;Chiba Masahito และผู้แต่งคนอื่นๆ. A survey of Thai learner's problems with Japanese pronunciation and native teachers' perspectives about pronunciation teaching. ม.ป.ท.:Siam University, 2009. Print.