Deborah Roseline P., Santhosh P. K., Philomina Jenifer A., Rajkumar M. G., Vishvanthini G. “Iot Based Smart Stickfor Visually Challenged Using Lora”. International Journal of Advanced Science and Technology, Vol. 29, no. 1, Jan. 2020, pp. 1853 -56, http://sersc.org/journals/index.php/IJAST/article/view/38079.