APA (7th ed.) Citation

Chadwick, O., & Chadwick, H. (1971). The Pelican History of the Church. Penguin Books.

Chicago Style (17th ed.) Citation

Chadwick, Owen, and Henry Chadwick. The Pelican History of the Church. Harmondsworth: Penguin Books, 1971.

MLA (9th ed.) Citation

Chadwick, Owen, and Henry Chadwick. The Pelican History of the Church. Penguin Books, 1971.