Trainattawan, Winai, Natthapan Phianthanyakam, Paradorn Yingyoud, Panida Chaiwang, Raphatphorn Petchsuk, and Pramote Thangkratok. 2020. “Improving health literacy among elderly”. Journal of Medicine and Health Sciences 27 (3):131-44. https://he01.tci-thaijo.org/index.php/jmhs/article/view/246838.