Pasri, P., S. Suwanruangsri, K. Hounsri, K. Balthip, and U. Boonyasopun. “The Development of Gratitude-Promoting Program for Nursing Students: A pilot study”. Journal of Research in Nursing-Midwifery and Health Sciences, vol. 41, no. 3, Aug. 2021, pp. 13-23, https://he02.tci-thaijo.org/index.php/nur-psu/article/view/250440.