WESSELS, WOLFGANG, and FRANZISKA BOPP. The Institutional Architecture of CFSP after the Lisbon Treaty ? Constitutional Breakthrough or Challenges Ahead?. Brussels: Centre for European Policy Studies, 2008.

Regelsberger, E., and WOLFGANG WESSELS. The Evolution of the Common Foreign and Security Policy. A case of an Imperfect Ratchet Fusion., 2005.

WESSELS, WOLFGANG. Theoretical Perspectives. CFSP beyond the Supranational and Intergovernmental Dichotomy., 2005.