Age effects on second language acquisition: Critical issues under debate - David Birdsong (ed.), Second language acquisition and the Critical Period Hypothesis. Mahwah, NJ: Erlbaum (1999). Pp. x + 191. ISBN 0-8058-3084-7 (hardback). - Alene Moyer, Age, accent and experience in second language acquisition: An integrated approach to Critical Period inquiry. Clevedon: Multilingual Matters (2004). Pp. vii + 179. ISBN 1-85359-717-1 (paperback). - Carmen Muñoz (ed.), Age and the rate of foreign language learning. Clevedon: Multilingual Matters (2006). Pp. xi + 283. ISBN 1-85359-892-5 (hardback). - David Singleton & Lisa Ryan, Language acquisition: The age factor. Clevedon: Multilingual Matters (2004) 2nd edition. Pp. viii + 289. ISBN 1-85359-757-0 (paperback). | Publicación