Kriengkrai Sakulprasertsri และ Jutarat Vibulphol. (2014) EFFECTS OF AN ENGLISH INSTRUCTION USING THE FLIPPED LEARNING APPROACH ON ENGLISH ORAL COMMUNICATION ABILITY AND MOTIVATION IN ENGLISH LEARNING OF UPPER SECONDARY SCHOOL STUDENTS. Chulalongkorn University:ม.ป.ท.Kriengkrai Sakulprasertsri และ Jutarat Vibulphol. 2014. EFFECTS OF AN ENGLISH INSTRUCTION USING THE FLIPPED LEARNING APPROACH ON ENGLISH ORAL COMMUNICATION ABILITY AND MOTIVATION IN ENGLISH LEARNING OF UPPER SECONDARY SCHOOL STUDENTS. ม.ป.ท.:Chulalongkorn University;Kriengkrai Sakulprasertsri และ Jutarat Vibulphol. EFFECTS OF AN ENGLISH INSTRUCTION USING THE FLIPPED LEARNING APPROACH ON ENGLISH ORAL COMMUNICATION ABILITY AND MOTIVATION IN ENGLISH LEARNING OF UPPER SECONDARY SCHOOL STUDENTS. ม.ป.ท.:Chulalongkorn University, 2014. Print.