Tandatanaya, Piyamart, and Tongluck Boontham. “Happiness in Learning among Pre-cadet Students’ in National Defence Studies Institute”. KASEM BUNDIT JOURNAL 20, no. May (May 2, 2019): 100–110. accessed September 16, 2026. https://so04.tci-thaijo.org/index.php/jkbu/article/view/180971.