2004 European Union Organized Crime Report. Luxembourg: Office for Official Publications of the European Communities, 2004.
States, National Commission. The 9/11 Commission Report. Washington, D.C.: Government Printing Office, 2004.
The 9/11 Commission Report: Executive Summary. Washington, D.C.: U.S. Government Printing Office, 2004.
Schuwirth, Rainer. "
Actors and Witnesses." In
EU Security and Defence Policy: The First Five Years (1999–2004), 241. Paris: Institute for Security Studies, 2004.
Yükselen, Hasan. Actors In The South Caucasus: Stability Providers Or Instability Exploiters In
Department of International Relations. Vol. Master Of Science In International Relations. Middle East Technical University, 2004.
Smarandache, F., and J. Dezert. Advances and Applications of DSmT. Vol. 1. Rehoboth: American Research Press, 2004.