APA (7th ed.) Citation

Dennett, D. C. (2007). Breaking the spell: Religion as a natural phenomenon. Penguin Books.

Chicago Style (17th ed.) Citation

Dennett, D. C. Breaking the Spell: Religion as a Natural Phenomenon. London [u.a.]: Penguin Books, 2007.

MLA (8th ed.) Citation

Dennett, D. C. Breaking the Spell: Religion as a Natural Phenomenon. Penguin Books, 2007.

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