O'Brennan, John (2006) 'Bringing Geopolitics Back In': Exploring the Security Dimension of the 2004 Eastern Enlargement of the European Union. Cambridge Review of International Affairs, 19 (1). pp. 155-169. ISSN 0955-7571

O'Brennan, John (2011) A Europe of Judges. Social Europe Journal, July 5th, 2011 .

O'Brennan, John (2001) A Social Constructivist Perspective on Enlargement. In: Actors and models : assessing the European Union's external capability and influence. Euryopa Etudes (11). Institut européen de l'Université de Genève, Geneva, pp. 161-187. ISBN 9782940174119

O'Brennan, John (2008) Alte Kräfte drängen Serbien in die Isolation. Die Welt, January 18th, 2008 .

O'Brennan, John (2009) Anxious EU's future at stake. The Australian, September 29th, 2009 .

O'Brennan, John (2007) Beyond Sovereignty: From Status Law to Transnational Citizenship? Hokkaido: Slavic Research Centre. Osamu Ieda (ed.). Slavic Review, 66 (3). pp. 532-533. ISSN 0037-6779

O'Brennan, John (2008) Building States without Society: European Union Enlargement and the Transfer of EU Social Policy to Poland and Hungary by Beate Sissenich. Slavic Review, 67 (4). pp. 1007-1008. ISSN 0037-6779

O'Brennan, John (2007) Conclusion: National parliaments gradually learning to play the European game? In: National parliaments within the enlarged European Union : from 'victims' of integration to competitive actors? Routledge advances in European politics (47). Routledge, Abingdon, pp. 245-261. ISBN 9780415399357

O'Brennan, John (2011) Do we need a referendum? Sunday Business Post . p. 19. ISSN 0791-2617

O'Brennan, John (2012) EU Enlargement 1989-2009: Actors, Institutions, and Literature. In: Handbook of the 1989 Revolutions. Sage, London, pp. 1-23.

O'Brennan, John (2002) EU Enlargement as a Factor in Ireland's Nice Treaty Referendum. Perceptions: Journal of International Affairs, 7 (3). pp. 78-94.

O'Brennan, John (2005) EU offer would boost reform in Turkey. Irish Times, September 28th, 2005 .

O'Brennan, John (2008) EU-Déjà vu - Ireland's No to Lisbon. Federalist Debate, 21 (3). pp. 5-11.

O'Brennan, John and Gassie, Esmeralda (2009) From Stabilization to Consolidation: Albanian State Capacity and Adaptation to European Union Rules. Journal of Balkan and Near Eastern Studies, 11 (1). pp. 61-82. ISSN 1944-8953

O'Brennan, John (2012) Government and Parliament. In: Foreign Policy in the Republic of Ireland. Royal Irish Academy, Dublin, pp. 1-15.

O'Brennan, John (2007) Introduction: Deparliamentarization through European Integration? In: National Parliaments within the Enlarged European Union: from ‘Victims’ of Integration to Competitive Actors? Routledge advances in European politics (47). Routledge, Abingdon, pp. 1-19. ISBN 9780415399357

O'Brennan, John (2008) Ireland & the Lisbon Treaty: Quo Vadis? CEPS Policy Brief (175). pp. 1-13.

O'Brennan, John (2010) Ireland and the European Union: Mapping Domestic Modes of Adaptation and Contestation. In: Irish Business and Society. Gill & MacMillan, Dublin, pp. 379-397. ISBN 9780717149902

O'Brennan, John (2008) Ireland must vote on whether we remain a member of the EU. Irish Times, December 9th, 2008 .

O'Brennan, John (2009) Ireland says No (again): the 12 June 2008 Referendum on the Lisbon Treaty. Parliamentary Affairs, 62 . pp. 258-277. ISSN 0031-2290

O'Brennan, John (2009) Ireland’s European referendum: second take, high stake. openDemocracy . pp. 1-5.

O'Brennan, John (2010) Ireland’s existential crisis: a contrary view. openDemocracy . pp. 1-6.

O'Brennan, John (2008) Ireland’s plan to resurrect the Lisbon Treaty to be unveiled at the Brussels summit. CEPS Commentary . pp. 1-3.

O'Brennan, John (2008) Ireland’s plan to resurrect the Lisbon Treaty to be unveiled at the Brussels summit: CEPS Commentary/4 December 2008. CEPS Commentary, December 4th, 2008 .

O'Brennan, John (2009) Irlanda decide otra vez. El Pais, September 30th, 2009 .

O'Brennan, John (2004) Kosovo: can sharing of power ever work? Irish Times, March 30th, 2004 .

O'Brennan, John (2008) Kosovo: the hour of Europe. openDemocracy . pp. 1-4.

O'Brennan, John (2003) Leadership Vacuum at heart of EU Exposed? Irish Times, December 17th, 2003 .

O'Brennan, John (2011) Legal crisis looming for European project. The Gulf Times, July 19th, 2011 .

O'Brennan, John (2009) Recession will be the wild card in second Irish treaty referendum. Europe's World, Spring, 2009 .

O'Brennan, John (2008) Reflecting on a second Irish Lisbon referendum. EurActiv, November 10th, 2008 .

O'Brennan, John (2008) Serbia to choose EU orbit or isolation. The Japan Times, January 18th, 2008 .

O'Brennan, John (2008) The EU in the western Balkans: Enlargement as Empire? A Response to David Chandler. Global Society, 22 (4). pp. 507-518. ISSN 1360-0826

O'Brennan, John (2012) The European Commission, transnational Advocacy and civil society in the Western Balkans. In: The European Commission, transnational Advocacy and civil society in the Western Balkans. Routledge, London, pp. 1-21.

O'Brennan, John (2008) The Irish think again about the Lisbon Treaty. China Daily, December 12th, 2008 .

O'Brennan, John (2011) Una Europa de Jueces? El Nuevo Dia, July 11th, 2011 .

O'Brennan, John (2008) Will Ireland say 'yes' to Lisbon? The Guardian, December 8th, 2008 .