1. Bayertz Kurt. Staat und Solidaritat in Id. (eds.) Politik und Ethik Reclam Ditzingen 1996 305–29.
2. Four Uses of “Solidarity”
3. Bresso Mercedes and Elmar Brok. “On Improving the Functioning of the European Union Building on the Potential of the Lisbon Treaty.” Report at the European Parliament. January 9 2017.
4. Brunkhorst, Hauke. Solidarity: From Civic Friendship to a Global Legal Community. Boston: MIT Press, 2005.
5. Cooper Ian. “The Euro Crisis as the Revenge of Neo-functionalism”. EU Observer. https://euobserver.com/opinion/113682.