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              Balfour R, Emmanouilidis JA, Grabbe H, Lochocki T, Mudde C, Schmidt J, et al. Europe's troublemakers: The populist challenge to foreign policy Brussels; 2016. http://www.epc.eu/documents/uploads/pub_6377_europe_ s_troublemakers.pdf. Accessed 21 July 2017.
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              Balfour, R., Emmanouilidis, J. A., Grabbe, H., Lochocki, T., Mudde, C., Schmidt, J., & Fieschi, C. (2016). Europe's troublemakers the populist challenge to foreign policy. European Policy Center.
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              Balfour, R., Emmanouilidis, J.A., Grabbe, H., Lochocki, T., Mudde, C., Schmidt, J. and Stratulat, C. (2016) Europe's Troublemakers -The Populist Challenge to Foreign Policy (Brussels: Eu- ropean Policy Centre).
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              Balfour, R., J. A. Emmanouilidis, H. Grabbe, T. Lochocki, C. Mudde, J. Schmidt, and C. Fieschi. 2016. Europe's Troublemakers the Populist Challenge to Foreign Policy. Brussels: European Policy Center.
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              Balfour, R., Emmanouilidis, J. A., Grabbe, H., Lochocki, T., Mudde, C., Schmidt, J., . (2016). Europe's troublemakers: The populist challenge to foreign policy Brussels. Brussels: Eu- ropean Policy Centre.
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