Silpakampises, K., and S. Suwanwaha. “Risk Factors Affecting Falls Among Old Adults in Community: A Systematic Review”. KASEM BUNDIT JOURNAL, vol. 20, no. Feburary, Feb. 2019, pp. 23-38, https://so04.tci-thaijo.org/index.php/jkbu/article/view/173417.