Sinturat, T., Kosashunhanan, K., Iamlaor, A., Khunasathitchai , K., & Teptong, N. (2022). English Speaking Problems of Engineering Students: A Case Study of Rajamangala University of Technology Thanyaburi. Journal of Roi Kaensarn Academi, 7(5), 1–9. สืบค้น จาก https://so02.tci-thaijo.org/index.php/JRKSA/article/view/256034