APA (7th ed.) Citation

Orwell, G. (1967). Nineteen eighty four. Penguin Books.

Chicago Style (17th ed.) Citation

Orwell, George. Nineteen Eighty Four. London: Penguin Books, 1967.

MLA (9th ed.) Citation

Orwell, George. Nineteen Eighty Four. Penguin Books, 1967.