Medina Serrano, R., González Ramírez, M.R., Gascó, J.L. and 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 (Dec. 2021), 30–49. DOI:https://doi.org/10.33422/ijarme.v4i1.480.