Siwaporn Suvarnamani. (2017) A Study of Grammatical and Lexical Errors in Descriptive Writing of First Year Arts Students at Silpakorn University. <i>Silpakorn University Journal of Social Sciences, Humanities, and Arts</i>, <i>17</i>(2), 239-264.Siwaporn Suvarnamani. "A Study of Grammatical and Lexical Errors in Descriptive Writing of First Year Arts Students at Silpakorn University". Silpakorn University Journal of Social Sciences, Humanities, and Arts 17 (2017):239-264.Siwaporn Suvarnamani. A Study of Grammatical and Lexical Errors in Descriptive Writing of First Year Arts Students at Silpakorn University. Silpakorn University Research and Development Institute:ม.ป.ท. 2017.