APA (7th ed.) Citation

Martin, S. (2010). The gnostics: The first Christian heretics. Pocket Essentials.

Chicago Style (17th ed.) Citation

Martin, Sean. The Gnostics: The First Christian Heretics. Harpenden, Herts: Pocket Essentials, 2010.

MLA (9th ed.) Citation

Martin, Sean. The Gnostics: The First Christian Heretics. Pocket Essentials, 2010.

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