Balthip, Karnsunaphat, and Danita Atiwiwat. “Effects of a Gratitude-Promoting Program on Purpose in Life and Heart Rate Variability among Vulnerable Thai Youth: A Quasi-Experimental Study”. Pacific Rim International Journal of Nursing Research 30, no. 4 (September 7, 2026): 995–1015. accessed September 18, 2026. https://he02.tci-thaijo.org/index.php/PRIJNR/article/view/279654.