Aroonrung Siricharoen และ Raksangob Wijitsopon. (2016) Lexical bundles in authentic and textbook english business emails : a corpus-based comparative study. Chulalongkorn University:ม.ป.ท.Aroonrung Siricharoen และ Raksangob Wijitsopon. 2016. Lexical bundles in authentic and textbook english business emails : a corpus-based comparative study. ม.ป.ท.:Chulalongkorn University;Aroonrung Siricharoen และ Raksangob Wijitsopon. Lexical bundles in authentic and textbook english business emails : a corpus-based comparative study. ม.ป.ท.:Chulalongkorn University, 2016. Print.