@book{
title = {Lehrbuch 1 mit DVD},
author = {},
editor = {Koithan, Ute},
editor = {Moritz, Ulrike},
editor = {Ochmann, Nana},
editor = {998063040308896 - Aspekte neu B1+ - [5] : Mittelstufe Deutsch -  },
year = {2017},
address = {Stuttgart },
publisher = {Klett},
}