Sarit Siribud และ Kanyarat Getkham. (2015) A comparison of authorial stances in speech genres : a corpus-based study. National Institute of Development Administration:ม.ป.ท.Sarit Siribud และ Kanyarat Getkham. 2015. A comparison of authorial stances in speech genres : a corpus-based study. ม.ป.ท.:National Institute of Development Administration;Sarit Siribud และ Kanyarat Getkham. A comparison of authorial stances in speech genres : a corpus-based study. ม.ป.ท.:National Institute of Development Administration, 2015. Print.