Suparman, Erni, Zetta, Hobes, and Yovie Ernanda. 2021. “The Influence of Leadership Style, Motivation, and Work Discipline on Employee Performance PT. Perkebunan IV Kebun Adolina Nusantara Perbaungan”. Jurnal Mantik 5 (2):526-35. https://doi.org/10.35335/mantik.Vol5.2021.1361.pp526-535.