- Uncomfortable Wars Revisited (International and Security Affairs Series)
- Gangs, Pseudo-militaries, and Other Modern Mercenaries: New Dynamics in Uncomfortable Wars
- El Salvador at War: An Oral History of Conflict from the 1979 Insurrection to the Present
- A Contemporary Challenge to State Sovereignty: Gangs and Other Illicit Transnational Criminal Organizations in Central America, El Salvador, Mexico, (Security Issues in the Western Hemisphere)
- Beyond Declaring Victory and Coming Home: The Challenges of Peace and Stability Operations