Promsri, A., and S. Chamnongkich. “Comparison of Gait Parameters Between Elderly Women With and Without Balance Impairment During Walking over Obstacle”. Journal of Associated Medical Sciences, vol. 43, no. 1, Jan. 2010, p. 39, https://he01.tci-thaijo.org/index.php/bulletinAMS/article/view/60067.