Boonrattanakul, W., Siljaru, T. ., & Worawattanaparinya, S. (2021). Guidelines for Operating Businesses for Elderly in Thailand. Princess of Naradhiwas University Journal, 13(2), 161–182. Retrieved from https://li01.tci-thaijo.org/index.php/pnujr/article/view/246532