@book{
title = {Las claves del nuevo DELE A2 },
author = {Martínez, María José},
editor = {Pilar Soria, Marìa},
editor = {Sánchez, Daniel},
editor = {Compl. del tit. dal dorso del libro },
year = {2011},
address = {Barcelona },
publisher = {Difusión},
}