1. Amersfoort, H., et al. (1984). International migration, the economic crisis and the state: An analysis of the Mediterranean migration to Western Europe. Ethnic and Racial Studies, 7(2), 238–268.
2. Barbulescu, R. (2012). Mobile union citizens should have portable voting rights. In R. Bauböck et al. (Eds.), Should EU citizens living in other member states vote there in national elections? (Working Paper No. 32/2012), Robert Schuman for Advanced Studies, EUDO Citizenship Observatory.
3. Barbulescu, R. (2013). The politics of immigrant integration in post-enlargement Europe: Migrants, co-ethnics and European citizens in Italy and Spain. PhD thesis in Department of Social and Political Sciences, European University Florence, Florence.
4. Barbulescu, R. (2014). EU freedom of movement is coming under increasing pressure in the UK and other European states . LSE European Politics and Policy Blog. http://blogs.lse.ac.uk/europpblog/2014/02/20/eu-freedom-of-movement-is-coming-under-increasing-pressure-in-the-uk-and-other-european-states/ . Accessed 15 July 2015.
5. Bauböck, R. (2007). Why European citizenship? Normative approaches to supranational union. Theoretical Inquiries in Law, 8(2), 453–488.