Promkeaw, Donlaya, Lugkana Mato, Thiwabhorn Thaweewannaki, Preeda Arrayawichanon, Wilairat Saensook, and Sugalya Amatachaya. 2018. “Walking on Different Surfaces Challenged Ability of Community-Dwelling Elderly”. Archives of Allied Health Sciences 30 (1). Khon Kaen, Thailand:39-46. https://he01.tci-thaijo.org/index.php/ams/article/view/126631.