APA (7th ed.) Citation

Orwell, G., Batchelor, J., & Halas, J. (2000). Animal farm: A fairy story. Penguin Classics.

Chicago Style (17th ed.) Citation

Orwell, George, Joy Batchelor, and John Halas. Animal Farm: A Fairy Story. [London]: Penguin Classics, 2000.

MLA (9th ed.) Citation

Orwell, George, et al. Animal Farm: A Fairy Story. Penguin Classics, 2000.