@book{63768,
	author = {Catholic Church and Welty, Eberhard},
	title = {La encíclica social del Papa Juan XXIII, Mater et magistra},
	publisher = {Editorial Herder},
	year = {c1963.},
	series = {Pequeña Biblioteca Herder},
	address = {Barcelona},
	note = {"Segunda edición 1965."--Verso t.p.}
}