@book{52449,
	author = {Cosío Villegas, Daniel},
	title = {El sistema político mexicano},
	publisher = {Editorial J. Mortiz},
	year = {1979, c1972.},
	series = {Cuadernos de Joaquin Mortiz},
	address = {México, D.F.},
	edition = {12a ed.}
}