Greene, G. (1999). The heart of the matter. Penguin Books.
Lua i Stíl Chicago (17ú heag.)Greene, Graham. The Heart of the Matter. New York: Penguin Books, 1999.
Lua MLA (8ú heag.)Greene, Graham. The Heart of the Matter. Penguin Books, 1999.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.