อิทธิ์ประเสริฐ ส., and บุญยัง ก. “Quality of Life of the Elderly in Klaeng Kachet Municipality, Mueang District, Rayong Province”. Local Administration Journal, vol. 11, no. 2, June 2018, pp. 139-54, https://so04.tci-thaijo.org/index.php/colakkujournals/article/view/130508.