Abdel Jawad, Y. A. L., S. Zabada, and I. Ayyash. “The Economic Cost and Environmental Effects of Paper Consumption and Computers Usage”. International Journal of Energy Economics and Policy, vol. 11, no. 1, Dec. 2020, pp. 302-7, https://www.econjournals.com/index.php/ijeep/article/view/10375.