@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.} }