APA (7th ed.) Citation

Greene, G. (1999). The heart of the matter. Penguin Books.

Chicago Style (17th ed.) Citation

Greene, Graham. The Heart of the Matter. New York: Penguin Books, 1999.

MLA (8th ed.) Citation

Greene, Graham. The Heart of the Matter. Penguin Books, 1999.

Warning: These citations may not always be 100% accurate.