Laowanich, N., M. Punyaratabandhu, N. Patcharatanasan, and E. Lukkanalikitkul. “Factors associated with Happiness among Registered Nurses”. Nursing Journal of The Ministry of Public Health, vol. 31, no. 2, Aug. 2021, pp. 181-94, https://he02.tci-thaijo.org/index.php/tnaph/article/view/252593.