APA (7th ed.) Citation

Power, S. (2003). "A problem from hell": America and the age of genocide. Flamingo.

Chicago Style (17th ed.) Citation

Power, Samantha. "A Problem from Hell": America and the Age of Genocide. London: Flamingo, 2003.

MLA (8th ed.) Citation

Power, Samantha. "A Problem from Hell": America and the Age of Genocide. Flamingo, 2003.