APA
Opałka E., Bienias S., Gapski T. & Polska. (2011). Evidence-based Cohesion Policy and its role in achieving Europe 2020 objectives: Background Report. Warszawa: Ministry of Regional Development. Department of Structural Policy Coordination.
Chicago
Opałka Elżbieta, Bienias Stanisław, Gapski Tomasz and Polska. 2011. Evidence-based Cohesion Policy and its role in achieving Europe 2020 objectives: Background Report. Warszawa: Ministry of Regional Development. Department of Structural Policy Coordination.
Harvard
Opałka E., Bienias S., Gapski T. and Polska. (2011). Evidence-based Cohesion Policy and its role in achieving Europe 2020 objectives: Background Report. Warszawa: Ministry of Regional Development. Department of Structural Policy Coordination.
MLA
Opałka Elżbieta, Bienias Stanisław, Gapski Tomasz and Polska. Evidence-based Cohesion Policy and its role in achieving Europe 2020 objectives: Background Report. Warszawa: Ministry of Regional Development. Department of Structural Policy Coordination. 2011.