@book{
title = {Arbeitsheft},
author = {Kollecker, Doris},
editor = {Großekettler, Friedericke},
editor = {Szugger, Annette},
editor = {998026803208896 - Frohes Lernen 2 -  },
year = {2014},
address = {Stuttgart [etc.] },
publisher = {Klett},
}