Warunee Promsen. 2011. An analysis of persuasive language in vocational certificate english textbooks. , Chiangrai Rajabhat University;
Warunee Promsen. (2011) An analysis of persuasive language in vocational certificate english textbooks . Chiangrai Rajabhat University/Chiangrai.
Warunee Promsen. An analysis of persuasive language in vocational certificate english textbooks. . Chiangrai:Chiangrai Rajabhat University, 2011.
Warunee Promsen. (2011) An analysis of persuasive language in vocational certificate english textbooks . Chiangrai Rajabhat University/Chiangrai.