Somsak Kaewnuch. (2557) A Comparison of Low and High Proficiency Secondary School Students' Syntactic Development: How Cognition Affects the Learning of a Foreign Language. <i>วารสารครุพิบูล</i>, <i>1</i>(2), 65.Somsak Kaewnuch. "A Comparison of Low and High Proficiency Secondary School Students' Syntactic Development: How Cognition Affects the Learning of a Foreign Language". วารสารครุพิบูล 1 (2557):65.Somsak Kaewnuch. A Comparison of Low and High Proficiency Secondary School Students' Syntactic Development: How Cognition Affects the Learning of a Foreign Language. คณะครุศาสตร์ มหาวิทยาลัยราชภัฏพิบูลสงคราม:ม.ป.ท. 2557.