SIAHAAN, R. B. D. The Effect of Education and Training on Improving the Quality of Employee Work at PPA MDC Medan. Journal of Management Science (JMAS), [S. l.], v. 2, n. 3, Juli, p. 68–71, 2019. Disponível em: https://exsys.iocspublisher.org/index.php/JMAS/article/view/34. Acesso em: 25 may. 2026.