Wei และผู้แต่งคนอื่นๆ. (2012) An investigation of factors contributing to speaking-in-class anxiety perceived by Engish Majors at Naresuan University /. Naresuan University,:ม.ป.ท.Wei และผู้แต่งคนอื่นๆ. 2012. An investigation of factors contributing to speaking-in-class anxiety perceived by Engish Majors at Naresuan University /. ม.ป.ท.:Naresuan University,;Wei และผู้แต่งคนอื่นๆ. An investigation of factors contributing to speaking-in-class anxiety perceived by Engish Majors at Naresuan University /. ม.ป.ท.:Naresuan University, 2012. Print.