Pudlar, Chadatarn, Watunyu Wichakriengkai, and Dhitiporn Keerajit. 2023. “Approaches to develop the quality of life the elderly by encouraging the elderly to use smart phones: A case study of Bang Phlap Subdistrict Municipality Community, Pak Kret District, Nonthaburi Province”. Doctor of Philosophy in Social Sciences Journal 2 (3):46-61. https://so08.tci-thaijo.org/index.php/dpssj/article/view/2467.