@book{
title = {Das Zahlenbuch 5},
author = {},
editor = {Affolter, Walter},
editor = {Bendetta, Angelika},
editor = {998053045308896 - Das Zahlenbuch - Bd. 5 -  },
year = {2013},
edition = {2. Aufl},
address = {Bozen},
publisher = {Pädagogisches Institut für die deutsche Sprachgruppe},
}