Boonpairoj, Sasithorn, and Piyaporn Phumkeaw. 2019. “The Development of Word Spelling Drills in Thai Language By Using Balance Literacy Model for Prathomsuksa I Students”. Ubon Ratchathani Journal of Research and Evaluation 8 (2):122-32. https://so06.tci-thaijo.org/index.php/ubonreseva/article/view/215261.