3Albert Copp6, The Economic and Political Problems of Integration, Law and Contemporary Problems, European Regional Communities, Vol. 26, No. 3, Summer 1961, pp. 349 - 363.
4Glyn Morgan, European Political Integration and the Need for Justification, Constellations, Vol. 14, Issue 3, 2007, pp. 332 - 346.
5Karl W. Deutsch, Nationalism and Social Communication, New York. Wiley, 1953, p. 57.
6Richard L. Sklar, Political Science and National Integration. A Radical Approach, The Journal of Modern African Studies, Vol. 5, No. 1, 1967, pp. 1 - 11.
7W. Russell Neuman, Differentiation and Integration. Two Dimensions of Political Thinking, American Journal of Sociology, Vol. 86, No. 6, 1981 , pp. 1236 - 1268.
8Paul Roscoe, The Problem With Polities. Some Problems in Forecasting Global Political Integration, Cross-cultural Research, Issue 38, 2004, p. 102.
9Gary Marks, European Integration and Political Conflict, Cambridge . Cambridge University Press, 2004.
10Laura C. Ferreira-Pereira, Portugal in the European Union. Assessing Twenty-five Years of Integration Experience, Advances in European Politics, 2012.
