Sundari, R., A. Arman, dan A. Setiawan. “Effect of Competence, Discipline and Work Facilities on Employee Performance: (survey at PT. Perkebunan Nusantara V Sei Pagar Palm Oil Mill)”. Jurnal Riset Manajemen Indonesia, vol. 4, no. 1, Januari 2022, hlm. 82-91, doi:10.55768/jrmi.v4i1.95.