@book{224453,
	author = {Ratzinger, Joseph},
	title = {Introducción al cristianismo},
	publisher = {Ediciones Sigueme},
	year = {1987.},
	series = {Pedal},
	address = {Salamanca},
	edition = {6a ed.},
	note = {Translation of: Einführung in das Christentum.}
}