@book{144592,
	author = {Copi, Irving M.},
	title = {Introducción a la lógica},
	publisher = {Eudeba: Editorial Universitaria de Buenos Aires},
	year = {1990.},
	series = {Manuales de Eudeba/ filosofia},
	address = {Buenos Aires},
	edition = {31. ed.},
	note = {American edition (New York, Macmillan, 1953) has title: Introduction to logic.}
}