Martinez, H. ., R. Pagayunan, J. . Reyes, R. . Estrada, T. . Miculob, and N. Buscagan. “Usability of Ultrasonic Sensor Blind Stick and Glove With GPS Tracking System”. Ascendens Asia Singapore – Bestlink College of the Philippines Journal of Multidisciplinary Research, vol. 2, no. 1, Apr. 2020, https://ojs.aaresearchindex.com/index.php/aasgbcpjmra/article/view/1397.