ศรีพยัคฆ์ ส. . ., and วิเชียรสินธุ์ เ. . . “Factors Impacting of Travels by Bus for the Visually Impaired in the Bangkok Metropolitan Region”. Engineering and Technology Horizons, vol. 34, no. 2, June 2020, pp. 56-62, https://ph01.tci-thaijo.org/index.php/lej/article/view/241423.