@book{205305,
	author = {Copi, Irving M.},
	title = {Introducción a la lógica},
	publisher = {Editorial Universitaria de Buenos Aires},
	year = {reimp., 2007.},
	series = {Manuales},
	address = {Buenos Aires},
	edition = {4a ed.},
	note = {Translation of: Introduction to logic, c1972.}
}