@book{
title = {Ein schönes Geheimnis},
author = {Mai, Manfred},
editor = {Lenz, Martin},
editor = {Zöller, Markus},
editor = {Età: dai 5 ai 10 anni },
year = {2014},
address = {Ravensburg },
publisher = {Ravensburger Buchverlag},
}