APA (7th ed.) Citation

Frank. (2002). Understanding September 11th: Answering questions about the attacks on America. Viking.

Chicago Style (17th ed.) Citation

Frank. Understanding September 11th: Answering Questions About the Attacks on America. New York: Viking, 2002.

MLA (8th ed.) Citation

Frank. Understanding September 11th: Answering Questions About the Attacks on America. Viking, 2002.

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