Ananda Lubis, F. R., and V. . . Winda Sari. “The Effect of Incentives and Work Stress on Employee Performance During the Covid-19 Pandemic at PTPN IV Plantation Land”. Jurnal Mantik, vol. 5, no. 4, Jan. 2022, pp. 2219-23, https://www.iocscience.org/ejournal/index.php/mantik/article/view/1967.