Bozovic, Jelena, and Ivan Bozovic. “Research and Improvement of Employee Motivation in Mining Companies: A Case Study of ‘Ibarski Rudnici’, Serbia”. International Review of Management and Marketing, vol. 9, no. 2, Mar. 2019, pp. 1-11, https://mail.econjournals.com/index.php/irmm/article/view/7464.