G. F. Ludeña-González, H. D. Lazarte-Reátegui, M. de L. Ferradas-Martinez, L. K. Chujutalli-Flores, J. P. Olano-Tantalean, and G. Ludeña-Manco, “The cost of child quality and Its Impact on child labour”, Revista InveCom, vol. 6, no. Especial 2, Sept. 2026, doi: 10.5281/zenodo.22740510.