@book{
title = {Übungsbuch},
author = {Swerlowa, Olga},
editor = {998074758408896 - Die Deutschprofis A2 -  },
editor = {In cop.: Deutsch als Fremdsprache },
editor = {Età: dai 9 ai 14 anni },
year = {2017},
address = {Stuttgart },
publisher = {Klett Sprachen},
}