Howorth, Jolyon. "The CSDP without the UK: bad for Europe but even worse for Britain." In The Common Security and Defence Policy: National Perspectives. Brussels: The Royal Institute for International Relations, 2015.

Howorth, Jolyon. Security and Defence Policy in the European Union. Basimgstoke: Palgrave MacMillan, 2014.

Biscop, Sven, Teija Tiilikainen, Stefano Silvestri, Nicole Gnesotto, Daniel Keohane, and Jolyon Howorth. What do Europeans Want from NATO?. Brussels: European Union Institute for Security Studies, 2010.

Howorth, Jolyon. Security and Defense Policy in the European Union. New York: Palgrave Macmillan, 2007.

Howorth, Jolyon. "From Security to Defence: The Evolution of the CFSP." In The International Relations of the European Union, 182. Oxford: Oxford University Press, 2005.

Howorth, Jolyon, and John T. S. Keeler. Defending Europe: The EU, NATO and the Quest for European Autonomy. New York: Palgrave Macmillan, 2003.

Howorth, Jolyon. "La France, l'OTAN et la sécurité européenne: statu quo ingérable, renouveau introuvable." Politique étrangère  (2002).

Howorth, Jolyon. European Integration and Defence: The Ultimate Challenge. Paris: WEU Institute for Security Studies, 2000.