gunjina mingkwan. The factors that were related to students’ happiness level of Bachelor Degree students at Rajamangala University of Techology Lanna Chiangmai. BALARMUTL [Internet]. 2019 Dec. 31 [cited 2024 May 4];7(2):73-84. Available from: https://so05.tci-thaijo.org/index.php/balajhss/article/view/193822