@book{120710,
	author = {Ezcurdia, Alberto de.},
	title = {Lecciones de teoría de la lógica},
	publisher = {M. Quesada Brandi Editor},
	year = {1970.},
	address = {Cuernavaca, México, D.F.},
	edition = {1a ed.},
	note = {Includes bibliographical footnotes.}
}