สาระทรัพย์ ว. “The Study of the Ability to Read for Main Idea of Grade 8 Students by Using the Teaching Learning Model SQ4R Along With the 6 Thinking Hats Method”. Journal of Education Khon Kaen University (Graduate Studies Research), vol. 11, no. 4, May 2018, pp. 186-92, https://so02.tci-thaijo.org/index.php/EDGKKUJ/article/view/125481.