APA (7th ed.) Citation

Warner, O., & Chadwick, A. P. (1951). The Crown Jewels. Penguin Books.

Chicago Style (17th ed.) Citation

Warner, Oliver, and Albert Paxton Chadwick. The Crown Jewels. Harmondsworth: Penguin Books, 1951.

MLA (9th ed.) Citation

Warner, Oliver, and Albert Paxton Chadwick. The Crown Jewels. Penguin Books, 1951.