Supasiri Hongrittipun. (1990) An investigation into the effects of self-correction in combination with peer correction on students writing proficiency and their attitudes. Mahidol University,:ม.ป.ท.Supasiri Hongrittipun. 1990. An investigation into the effects of self-correction in combination with peer correction on students writing proficiency and their attitudes. ม.ป.ท.:Mahidol University,;Supasiri Hongrittipun. An investigation into the effects of self-correction in combination with peer correction on students writing proficiency and their attitudes. ม.ป.ท.:Mahidol University, 1990. Print.