APA (7th ed.) Citation

Porter, R. (2003). Blood and guts: A short history of medicine. Penguin.

Chicago Style (17th ed.) Citation

Porter, Roy. Blood and Guts: A Short History of Medicine. London [etc.]: Penguin, 2003.

MLA (9th ed.) Citation

Porter, Roy. Blood and Guts: A Short History of Medicine. Penguin, 2003.