Tamdee, P., S. Dendoung, M. Muttiko, and L. Sringernyuang. “Modern social life and never-married women’s health problems”. Kasetsart Journal of Social Sciences, vol. 37, no. 1, Feb. 2016, pp. 15-21, https://so04.tci-thaijo.org/index.php/kjss/article/view/242823.