Luangsombath, Soulichanh, Somchith Vongphachanh, Ammalin Phothiladth, and Chansy Phomphithak. 2020. “The Factors Affecting Learning English As a Foreign Language at Phoubachieng Upper Secondary School”. Souphanouvong University Journal Multidisciplinary Research and Development 6 (2):1-9. https://su-journal.com/index.php/su/article/view/259.