1. Ackrill, R., Kay, A., & Zahariadis, N. (2013). Ambiguity, multiple streams, and EU policy. Journal of European Public Policy, 20(6), 871–887.
2. Bardi, L. (2020). The heart of the core: The EPP group in the EU institutional and political framework. In L. Bardi, W. Gagatek, C. Germond, K. M. Johansson, W. Kaiser, & S. Sassano (Eds.), The European ambition: The group of the European People’s Party and European integration (pp. 255–334). Nomos.
3. Bardi, L., Bressanelli, E., Calossi, E., Cicchi, L., Gagatek, W., & Pizzimenti, E. (2014). Political parties and political foundations at European level. Challenges and opportunities. The European Parliament.
4. Baumgartner, F. R., & Jones, B. D. (1993). Agendas and instability in American politics. University of Chicago Press.
5. Béland, D., & Howlett, M. (2016). The role and impact of multiple-streams approach in comparative policy research. Journal of Comparative Policy Analysis, 18(3), 221–227.