Towards a European foreign policy : legal, economic, and political dimensions : records of a colloquium held by the Europa Institute of the University of Amsterdam on the occasion of its 25th anniversary / edited by Johan K. De Vree, Peter Coffey, Richard H. Lauwaars in collaboration with Max Jansen, Alfred E. Pijpers, and Edmond L.M. Völker ; with a preface by Hans van den Broek.