J. G. Morales Ramos, W. O. Rodríguez López, and W. E. Melgarejo Ángeles, “Environmental management program based on ISO 14001 standards for the sustainability of the universities”, revucvhacer , vol. 8, no. 4, pp. 35–39, Dec. 2019, doi: 10.18050/RevUCVHACER.v8n4a3.