Manurung, L., & Etty Harya Ningsi. (2021). The Effect of Rewards, Incentives and Welfare Allowances on Employee Morale at PT. PNM (Independent National Capital) Binjai. Jurnal Mantik, 5(3), 1989-1997. Retrieved from https://www.ejournal.iocscience.org/index.php/mantik/article/view/1827