APA (7th ed.) Zitazioa

Hughes, T. (1999). Birthday letters. Faber and Faber.

Chicago Style (17th ed.) Zitazioa

Hughes, Ted. Birthday Letters. London: Faber and Faber, 1999.

MLA (9th ed.) Zitazioa

Hughes, Ted. Birthday Letters. Faber and Faber, 1999.