Navarin Tagontong นวรินทร์ ตาก้อนทอง. “Using Formative Research to Develop Educational Quality”. Dusit Thani College Journal 11, no. 2 (April 9, 2018): 421–438. Accessed May 6, 2024. https://so01.tci-thaijo.org/index.php/journaldtc/article/view/120547.