Boonyakiat, Chanyapak, Kris Lietz, and Kitpinit Usaho. “English Listening and Speaking Difficulties and Self-Directed Enhancement Strategies among Undergraduate Aviation Business Students at North Bangkok University”. Journal of Buddhist Education and Research (JBER) 12, no. S1 (July 31, 2026): 1221–1232. accessed August 29, 2026. https://so06.tci-thaijo.org/index.php/jber/article/view/299147.