Nithin G, Ravi shankara M N, Mahesh N, Hemanth kumar V, and Mahesh K. “Aid for The Blind’s Using Raspberry Pi”. International Journal of Progressive Research in Science and Engineering, vol. 1, no. 4, July 2020, pp. 83-88, https://journal.ijprse.com/index.php/ijprse/article/view/106.