Tongsawang, Kamonrut, Suptawee Hirungerd, Yupahdi Sanguanphong, and Atithan Chairuang. 2024. “Level of Happiness and Factors Associated with Happiness among 21st Century Undergraduate Students, Chaiyaphum Rajabhat University”. Journal of The Royal Thai Army Nurses 25 (1):86-94. https://he01.tci-thaijo.org/index.php/JRTAN/article/view/264738.