U. V, . Ramón Eduardo Ruiz. Mexico: The Challenge of Poverty and Illiteracy. Revista Mexicana de Sociología, [S. l.], v. 28, n. 1, p. 213–215, 1966. DOI: 10.22201/iis.01882503p.1966.1.58588. Disponível em: https://www.revistamexicanadesociologia.unam.mx/index.php/rms/article/view/58588. Acesso em: 1 may. 2025.