G. A. León Duarte, “Luiz Beltrão, Décio Pignatari, Muniz Sodré and Sérgio Capparelli. Brazilian Theoretical Contributions to Latin American Thought in Communication”, Mediac. soc., no. 8, pp. 3–19, Sep. 2011, doi: 10.5209/rev_MESO.2011.n8.1.