Siriwan Tripet. (2005) Mahidol University first year student's environmental perception through communication processes. Mahidol University,:ม.ป.ท.Siriwan Tripet. 2005. Mahidol University first year student's environmental perception through communication processes. ม.ป.ท.:Mahidol University,;Siriwan Tripet. Mahidol University first year student's environmental perception through communication processes. ม.ป.ท.:Mahidol University, 2005. Print.