1. Daalder, H. (1987). "The Dutch Party System: From Segmentation to Polarization—And Then." In Party Systems in Denmark, Austria, Switzerland, The Netherlands and Belgium, ( H. Daalder, ed.), pp. 193-284. London: Pinter.
2. Daniels, P. (1993). "Italy and the Maastricht Treaty." In Italian Politics: A Review, (S. Hellman and G. Pasquino, eds.), Vol. 8: 178-191. London: Pinter .