Cita APA (7a ed.)

Leader, D., & Corfield, D. (2008). Why do people get ill?: Darian Leader and David Corfield (3rd edition.). Penguin Books.

Cita Chicago Style (17a ed.)

Leader, Darian, y David Corfield. Why Do People Get Ill?: Darian Leader and David Corfield. 3rd edition. London: Penguin Books, 2008.

Cita MLA (8a ed.)

Leader, Darian, y David Corfield. Why Do People Get Ill?: Darian Leader and David Corfield. 3rd edition. Penguin Books, 2008.