APA (7th ed.) Citation

Breen, S., & Conlon, O. (2021). The hitmen: The shocking true story of a family of killers for hire (Published with new material.). Penguin Books.

Chicago Style (17th ed.) Citation

Breen, Stephen, and Owen Conlon. The Hitmen: The Shocking True Story of a Family of Killers for Hire. Published with new material. UK USA Canada Ireland Australia India New Zeeland South Africa: Penguin Books, 2021.

MLA (9th ed.) Citation

Breen, Stephen, and Owen Conlon. The Hitmen: The Shocking True Story of a Family of Killers for Hire. Published with new material. Penguin Books, 2021.