1. Borgatti, S. P., Mehra, A., Brass, D. J., & Labiance, G. (2009). Network analysis in social sciences. Science, 323(5916), 892–895.
2. Börzel, A. T. (2002). States and regions in the European Union-institutional adaptation in Germany and Spain. Cambridge University Press.
3. Börzel, A. T. (2005). Europeanisation: How the European Union interacts with its member states in (eds) S. Bulmer and C. Lequesne The Members of the European Union (pp. 45–69). Oxford University Press.
4. Agriculture and environment;I Bowler,1992
5. Chatzopoulou, S., & Poulsen, B. (2017). Combining centralisation and decentralisation in Danish public administration. In J. M. Ruano & M. Profiriou (Eds.), The Palgrave handbook of decentralisation in Europe (pp. 273–297). Cham: Palgrave Macmillan.