SITOMPUL, S. D. The Measurement of Operator Level Labor Productivity in PT. X Packaging. Jurnal Mantik, [S. l.], v. 4, n. 4, p. 2699-2706, 2021. DOI: 10.35335/mantik.Vol4.2021.1240.pp2699-2706. Disponível em: https://iocscience.org/ejournal/index.php/mantik/article/view/1240. Acesso em: 4 aug. 2026.