Duangchan Sinpho. (1999) The role of active vocabulary in the development of the reading comprehension of diploma-level technical students. Mahidol University,:ม.ป.ท.Duangchan Sinpho. 1999. The role of active vocabulary in the development of the reading comprehension of diploma-level technical students. ม.ป.ท.:Mahidol University,;Duangchan Sinpho. The role of active vocabulary in the development of the reading comprehension of diploma-level technical students. ม.ป.ท.:Mahidol University, 1999. Print.