Studer M. Seymour Martin Lipset, The continental divide . The values ??and institutions of the United States and Canada, México, Fondo de Cultura Económica, 1993, 321 p. PyG [Internet]. 1994 Apr. 21 [cited 2026 Oct. 13];1(2):430-3. Available from: http://politicaygobierno.cide.edu/index.php/pyg/article/view/615