APA (7th ed.) Citation

Hardt & Negri. (2004). Multitude: War and democracy in the age of empire. Penguin Books.

Chicago Style (17th ed.) Citation

Hardt and Negri. Multitude: War and Democracy in the Age of Empire. United States: Penguin Books, 2004.

MLA (8th ed.) Citation

Hardt and Negri. Multitude: War and Democracy in the Age of Empire. Penguin Books, 2004.