30 years of the European single market: Databases and Websites

cvce.eu (University of Luxembourg)
The University of Luxembourg’s CVCE.eu website (former Centre Virtuel de la Connaissance sur l'Europe) gives you access to documents and publications on the European integration process.

It is a major information source available in English, French and German. Select your language preference in the top left sidebar.
Archives Portal Europe
The Archives Portal Europe provides access to information on archival material from different European countries as well as information on archival institutions throughout the continent.
EconBiz

Database on economic literature covering journals, working papers and conferences in Business Studies and Economics.
European Centre for International Political Economy (ECIPE)
The ECIPE is as policy research think tank providing the European debate with informed analyses and opinions about the international economy. Research topics include 'EU Single Market'.