https://www.investopedia.com/terms/d/demographics.asp#:~:text=The%20common%20variables%20gathered%20in,about%20groups%20to%20identify%20customers.
Subramanian.S., Paper- free payment systems in India - an analytical study, international journal of Management (IJM), Volume 5, Issue 1, January 2014, IAEME.
Vaibhav shahaji patil and Jyoti Mishra, A study to find out advantages and disadvantages of making India a cashless economy, Kaav international journal of economics, commerce & business management, jan-mar17/vol-4/iss-1/a12, 2017.