siriphan, Roongroj. “The Analytical Study of The Problems in Instructional Management for Programs of Certificate in English for Careers: Language Institute of Mahachulalongkornrajavidyalaya University”. Journal of MCU Languages and Cultures 1, no. 1 (June 29, 2022): 1–12. accessed May 25, 2025. https://so08.tci-thaijo.org/index.php/JMLC/article/view/356.