Ram Kumar Dwivedi, Shivang Rampriyan, Dr. Ankit Saxena, Dr. Arun Koushal, Himani Oberoi, Shivam Bharadwaj. “Free Riding Problem: Perspectives and Solutions”. International Journal of Advanced Science and Technology, Vol. 29, no. 10s, June 2020, pp. 4683-9, http://sersc.org/journals/index.php/IJAST/article/view/22031.