Ferry, Ferry, Livea Livea, and Hendry Hendry. 2020. “The Influence of Leadership, Motivation and Work Discipline on Employee Performance at PT Panjiwira Surya Mandiri Medan”. Jurnal Mantik 4 (2):1350-55. https://doi.org/10.35335/mantik.Vol4.2020.949.pp1350-1355.