Xuamolee, T., T. Souliya, K. Lamphaiphan, K. Sidavong, and T. Panmanivong. “Gender Differences in Academic Performance of English”. Souphanouvong University Journal Multidisciplinary Research and Development, vol. 7, no. 2, Dec. 2021, pp. 285-91, http://www.su-journal.com/index.php/su/article/view/143.