1. Garcia-Swartz, D. D., Hahn, R. W., & Layne-Farrar, A. (2006). The move toward a cashless society: A closer look at payment instrument economics. Review of Network Economics, 5(2), 199–228.
2. Capgemini. (2019). World payments report.
3. Ramya, N., Sivasakthi, D., & Nandhini, M. (2017). Cashless transaction: Modes, advantages and disadvantages. International Journal of Applied Research, 3(1), 122–125.
4. Sarkar, M. P. (2019). Literature review on adoption of digital payment system. Global Journal of Enterprise Information System, 11(3), 62–67.
5. Mohapatra, S. (2017). Unified payment interface (UPI): A cashless Indian e-transaction process. International Journal of Applied Science and Engineering, 5(1), 29.