Luangsombath, Soulichanh, Somchith Vongphachanh, Ammalin Phothiladth, and Chansy Phomphithak. “The Factors Affecting Learning English As a Foreign Language at Phoubachieng Upper Secondary School”. Souphanouvong University Journal Multidisciplinary Research and Development 6, no. 2 (December 5, 2020): 1–9. Accessed January 17, 2026. http://www.su-journal.com/index.php/su/article/view/259.