Pérez, L.A. and Gamboa Salinas, J.M. 2020. Quality in service, a potential foundation of competitiveness in the informal market of shoes. Espirales Revista Multidisciplinaria de investigación. 4, 32 (Mar. 2020), 36–49. DOI:https://doi.org/10.31876/er.v4i32.710.