RIVERA MEDINA, Eduardo J. Social Science Research Center of the Graduate School, Social Science and Preedom, Minnesota: University of Minnesota Press, 1955. 59 págs. Revista de Ciencias Sociales, [S. l.], n. 3, p. 533–535, 1957. Disponível em: https://revistas.upr.edu/index.php/rcs/article/view/10083. Acesso em: 17 ago. 2024.