Pholprasert, C. “The Language Analysis of Syntactic Structures Embedded in TOEFL Reading Comprehension Passages and The Language Achievement of Kasetsart University Students both Prior to and Following Their Undergoing a One-semester TOEFL Course”. Kasetsart Journal of Social Sciences, vol. 15, no. 1, Jan. 2020, pp. 66-71, https://so04.tci-thaijo.org/index.php/kjss/article/view/236902.