@book{
title = {Arbeitsbuch},
author = {Kopp, Gabriele},
editor = {Alberti, Josef},
editor = {Büttner, Siegfried},
editor = {998015701008896 - Planetino 2 : Deutsch für Kinder - 2 -  },
year = {2012},
address = {Ismaning },
publisher = {Hueber},
}