@inbook {Oppenheim1948,
	title = {Antifona},
	booktitle = {Enciclopedia catolica},
	volume = {I},
	year = {1948},
	address = {Roma},
	url = {http://ec.aciprensa.com/wiki/Ant\%C3\%ADfona ; http://www.newadvent.org/cathen/01575b.htm},
	author = {Oppenheim, F.}
}
