Yingyongsak, Warunya. “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 8, no. 2 (November 24, 2020): 69-88. Accessed September 22, 2021. https://so03.tci-thaijo.org/index.php/Humanties-up/article/view/248113.