@book{
title = {The three seeds},
author = {Puchta, Herbert},
editor = {Gerngross, Günter},
editor = {Macchia, Maria Sole},
editor = {Tit. dalla cop },
editor = {Segue: Appendice didattica },
editor = {Età: dai 9 ai 14 anni },
year = {2016},
address = {Rum},
publisher = {Helbling languages},
}