Pengsri, Narittiya. “The Development of English Speaking Ability for Communication of the 4th Year Students of Lampang Rajabhat University”. Humanities and Social Sciences Nakhonsawan Rajabhat University Academic Journal 9, no. 1 (July 1, 2022): 179–192. Accessed May 4, 2024. https://so05.tci-thaijo.org/index.php/hssnsru/article/view/254763.