Thongruk, P., Puttawong, K., Yaemmisri, W., Mongkhonittivech, N. and Boonyapak, P. (2024) “Effect of the Happiness Program on the Level of Happiness among Caregivers of Elderly with Dementia in Mae Lao District, Chiang Rai Province”, Journal of The Royal Thai Army Nurses, 25(3), pp. 214–222. available at: https://he01.tci-thaijo.org/index.php/JRTAN/article/view/267935 (accessed: 6 December 2025).