Mardhiko, A., Zaharuddin, Z. and Supriyadi, S. (2025) “The Influence of Leadership and Co-Worker Relationships on Employee Productivity at the Main Clinical Laboratory of Siaga Medika Jakarta”, International Journal of Business, Law, and Education, 6(1), pp. 315 - 325. doi: 10.56442/ijble.v6i1.1021.