Duke, Simon, and Hanna Ojanen. "Bridging Internal and External Security: Lessons from the European Security and Defence Policy." Journal of European Defence Policy 28, no. 5 (2006): 477-94; quoted at 493.

Duke, Simon. "The Convention, the Draft Constitution and External Relations: Effects and Implications for the EU and its International Role." In Working Paper. Maastricht: European Institute of Public Administration, 2003.

Duke, Simon. The EU and Crisis Management : Development and Prospects. Maastricht : European Institute of Public Administration, 2002.