MEDINA SERRANO, R.; GONZÁLEZ RAMÍREZ, M. R.; GASCÓ, J. L.; WELLBROCK, W. How to influence total costs of sourcing? A case study of SCOPQ with Six Sigma. International Journal of Applied Research in Management and Economics, [S. l.], v. 4, n. 1, p. 30–49, 2021. DOI: 10.33422/ijarme.v4i1.480. Disponível em: https://www.dpublication.com/journal/IJARME/article/view/480. Acesso em: 12 oct. 2025.