@book{
title = {Student's book & workbook},
author = {Hobbs, Martyn},
editor = {Starr Keddle, Julia},
editor = {998040147508896 - Sure : elementary -  },
editor = {In testa alla cop.: Cambridge CEFR A1/A2 },
year = {2014},
address = {Rum},
publisher = {Helbling languages},
}