APA (7th ed.) Citation

O'Donoghue, B. (2021). The Green Knight. Penguin Books.

Chicago Style (17th ed.) Citation

O'Donoghue, Bernard. The Green Knight. New York: Penguin Books, 2021.

MLA (8th ed.) Citation

O'Donoghue, Bernard. The Green Knight. Penguin Books, 2021.

Warning: These citations may not always be 100% accurate.