Zulkarnain, Zulkarnain, Pitriyani Pitriyani, and Abd. Halim. 2022. “Work Ethics, Progressive Discipline, and Work Engagement on Job Satisfaction of Labuhanbatu District Education Service Employees”. Indonesian Interdisciplinary Journal of Sharia Economics (IIJSE) 5 (2), 919-35. https://doi.org/10.31538/iijse.v5i2.3927.