Mudpongtua , Vachara. “Problems of English instructional management and needs on communication skills development in the 21st century of students in a private university in Bangkok”. Journal of Rattana Bundit University 15, no. 2 (December 30, 2020): 118–130. accessed August 27, 2026. https://so03.tci-thaijo.org/index.php/rbac/article/view/249134.