Wilawan Thipsoda และ Songsri Soranastaporn. (2013) A study of language learning strategies used and self-efficacy beliefs held by high- and low-achieving English major students. Mahidol University:ม.ป.ท.Wilawan Thipsoda และ Songsri Soranastaporn. 2013. A study of language learning strategies used and self-efficacy beliefs held by high- and low-achieving English major students. ม.ป.ท.:Mahidol University;Wilawan Thipsoda และ Songsri Soranastaporn. A study of language learning strategies used and self-efficacy beliefs held by high- and low-achieving English major students. ม.ป.ท.:Mahidol University, 2013. Print.