APA (7th ed.) Citation

O'Connell, M. E. (2012). What is war?: An investigation in the wake of 9/11. International humanitarian law series.

Chicago Style (17th ed.) Citation

O'Connell, Mary Ellen. "What Is War?: An Investigation in the Wake of 9/11." International Humanitarian Law Series 2012.

MLA (8th ed.) Citation

O'Connell, Mary Ellen. "What Is War?: An Investigation in the Wake of 9/11." International Humanitarian Law Series, 2012.