APA (7th ed.) Citation

Bellamy, Williams, & Griffin. (2004). Understanding peacekeeping. Polity Press.

Chicago Style (17th ed.) Citation

Bellamy, Williams, and Griffin. Understanding Peacekeeping. UK: Polity Press, 2004.

MLA (8th ed.) Citation

Bellamy, et al. Understanding Peacekeeping. Polity Press, 2004.