Sartono, Hasan, and Mauliah Ardhani. “Work Engagement, Intrinsic Motivation and Job Satisfaction Among Employees of A Coal Mining Company in South Borneo”. International Research Journal of Business Studies, vol. 8, no. 2, Aug. 2015, pp. 107-22, https://doi.org/10.21632/irjbs.8.2.107-122.