@book{
title = {English file digital gold A1/A2 },
author = {Latham-Koenig, Christina},
editor = {Oxenden, Clive},
editor = {Seligson, Paul},
editor = {Compl. del tit. dalla cop. },
year = {2017},
edition = {3th ed},
address = {Oxford },
publisher = {Oxford university press},
}