APA (7th ed.) Zitazioa

Hill, I. (2004). Ursula, under: Novel (First edition.). Penguin books.

Chicago Style (17th ed.) Zitazioa

Hill, Ingrid. Ursula, Under: Novel. First edition. New York: Penguin books, 2004.

MLA (9th ed.) Zitazioa

Hill, Ingrid. Ursula, Under: Novel. First edition. Penguin books, 2004.