APA (7th ed.) Citation

Norris, R. A. (2004). Gnostic literature. The Cambridge history of early Christian literature, 20-27.

Chicago Style (17th ed.) Citation

Norris, Richard A. "Gnostic Literature." The Cambridge History of Early Christian Literature 2004: 20-27.

MLA (8th ed.) Citation

Norris, Richard A. "Gnostic Literature." The Cambridge History of Early Christian Literature, 2004, pp. 20-27.