I've got general Euro History post-WWII down, but I'd like a deep analysis of the European Unification project, balancing both the legal/economic/political history (treaties, conferences, major players, etc.) and also (ideally) the political philosophy as it evolved post-WWII, and also any precedence in European intellectual thought (e.g., Goethe talked about European integration, no?).
I've googled around but, as one might expect, it's clear that many such books have a clear political angle and bias. Any recent, exemplary scholarship would be much appreciated.
I suspect you might enjoy Mark Mazower's Governing the World: the History of an Idea (New York: Penguin, 2012), which examines the idea of global governance in Europe from the Concert of Vienna in 1815 to the present. Be sure to check his endnotes for further reading.
You might also like Michael Barnett's Empire of Humanity: A History of Humanitarianism (Cornell, 2011) in which the author looks at the long history of institutionalized intervention. While not necessarily looking at the growth of the European community, Barnett tacitly shows how organizations, such as the International Committee of the Red Cross, contributed to NGO growth and, in some ways, a more cohesive community in Europe and beyond. The book is not without its problems, however. I hope this helps.