APA (7th ed.) Citation

Barry, J. M. (2004). The great influenza: The story of the deadliest pandemic in history. Penguin Books.

Chicago Style (17th ed.) Citation

Barry, John M. The Great Influenza: The Story of the Deadliest Pandemic in History. London: Penguin Books, 2004.

MLA (9th ed.) Citation

Barry, John M. The Great Influenza: The Story of the Deadliest Pandemic in History. Penguin Books, 2004.