Thearnsinee Pokatharap. (2005) Knowledge and attitudes of special education teachers towards students with hearing impairment in the northeast region. Mahidol University,:ม.ป.ท.Thearnsinee Pokatharap. 2005. Knowledge and attitudes of special education teachers towards students with hearing impairment in the northeast region. ม.ป.ท.:Mahidol University,;Thearnsinee Pokatharap. Knowledge and attitudes of special education teachers towards students with hearing impairment in the northeast region. ม.ป.ท.:Mahidol University, 2005. Print.