Mayangsari, R. E., L. C. Nawangsari, and A. H. Sutawidjaya. “Employee Green Behavior on Generation X and Y Millennial”. International Review of Management and Marketing, vol. 11, no. 4, July 2021, pp. 38-48, https://econjournals.com/index.php/irmm/article/view/11633.