Choothong, P., T. Bunprajun, C. Jalayondeja, and S. Pichaiyongwongdee. “Daily Walking Steps and Physical Fitness in Middle-Aged and Older Adults in Community Dwellers”. HCU Journal, vol. 20, no. 40s, May 2017, pp. 31-44, https://he01.tci-thaijo.org/index.php/HCUJOURNAL/article/view/148151.