Miguel Túñez-López; Valentín-Alejandro Martínez-Fernández; Xosé López-García; Xosé Rúas-Araújo; Francisco Campos-Freire (10 July 2018). Communication: Innovation & Quality. Springer International Publishing. p. 427. ISBN978-3-319-91860-0. Archived from the original on 3 October 2020. Retrieved 24 March 2020.
Miguel Túñez-López; Valentín-Alejandro Martínez-Fernández; Xosé López-García; Xosé Rúas-Araújo; Francisco Campos-Freire (10 July 2018). Communication: Innovation & Quality. Springer International Publishing. p. 427. ISBN978-3-319-91860-0. Archived from the original on 3 October 2020. Retrieved 24 March 2020.