Medina Serrano, R., González Ramírez, M. R., Gascó, J. L., & Wellbrock, W. (2021). How to influence total costs of sourcing? A case study of SCOPQ with Six Sigma. International Journal of Applied Research in Management and Economics, 4(1), 30–49. https://doi.org/10.33422/ijarme.v4i1.480