@book{
title = {Heidi},
author = {Sauser, Barbara},
editor = {Armellini, Chiara},
editor = {Spyri, Johanna},
editor = {Versione semplificata ad uso scolastico },
editor = {Con apparato didattico },
year = {2015},
address = {Recanati },
publisher = {ELI},
}