APA (7th ed.) Zitazioa

Greene, G. (1970). Twenty-one stories. Penguin Books.

Chicago Style (17th ed.) Zitazioa

Greene, Graham. Twenty-one Stories. Harmondsworth: Penguin Books, 1970.

MLA (9th ed.) Zitazioa

Greene, Graham. Twenty-one Stories. Penguin Books, 1970.