- The European Commission provides information and official documents on Enlargement and the European Neighbourhood Policy.
- The European External Action Service provides information and official documents on Neighbourhood Policy.
- The project website of the research consortium MAXCAP (Maximizing the Integration Capacity of the European Union; 2013–2016) provides access to publications and resources on the EU’s enlargements here.
- The project website of the research consortium EU-STRAT (2016–2019) provides access to publications and a research database on the relationship between the European Union and the countries in the European Eastern neighbourhood here.
- For an interesting debate on Western Balkan enlargement in the EP, see here.