Renuka B S, Sachin T M, Darshan Gowda M C. “Smart Phone Based Billing System for Android Users”. International Journal of Advanced Science and Technology 29, no. 7 (July 1, 2020): 11837 - 11842. Accessed May 5, 2024. http://sersc.org/journals/index.php/IJAST/article/view/27857.