1. Alt, J. (2003). Leben in der Schattenwelt. Problemkomplex “illegaler” migration. Von Loeper.
2. Andersson, R. (2014). Illegality, Inc: Clandestine migration and the business of bordering Europe. University of California Press.
3. Baldwin-Edwards, M., & Kraler, A. (Eds.). (2009). REGINE regularisations in Europe. Study on practices in the area of regularisation of illegally staying third-country nationals in the member states of the EU. ICMPD.
4. Benton, M., & Selee, A. (2022). The Ukrainian conflict could be a tipping point for refugee protection. Commentaries, Migration Policy Institute. https://www.migrationpolicy.org/news/ukrainian-displacement-refugee-protection
5. Bommes, M., & Thränhardt, D. (2010). Introduction: National paradigms of migration research. In M. Bommes & D. Thränhardt (Eds.), National Paradigms of Migration Research. (pp. 9–38). V+R Uni-Press.