Tshering, Lhendup, Tandin Tshomo, Ugyen Tshomo, Yeshi Jamtsho, and Bikram Chhetri. “Cashless Vending Machine”. Zorig Melong | A Technical Journal of Science, Engineering and Technology 8, no. 1 (June 20, 2025): 14–22. Accessed June 30, 2025. http://103.133.216.217/index.php/zm/article/view/122.