Yingyongsak, W. “Factors Influencing on Selecting of Research Topics: Case Study of Fourth-Year Undergraduate, Academic Year 2018, Thai Language Students, Faculty of Liberal Arts, University of Phayao”. Journal of Humanities and Social Sciences University of Phayao, Vol. 8, no. 2, Nov. 2020, pp. 69-88, https://so03.tci-thaijo.org/index.php/Humanties-up/article/view/248113.