Reverse Mission: Transnational Religious Communities and the Making of US Foreign Policy (Georgetown, 2011); Transnational Catholicism in Postcommunist Europe (Rowman & Littlefield, 2001); Catholic Bishops in American Politics (Princeton, 1991); Catholic Bishops in US Politics, guest editor, Religions, 2016; Religion in an Expanding Europe, co-editor. (Cambridge, 2006); Abortion Politics in American States, co-editor. (M.E. Sharpe, 1995), The Catholic Church and the Politics of Abortion, co-editor. (Westview Press, 1992); journal articles and book chapters on religion and politics in Europe in Current History (2008) reprinted in Religion and Foreign Affairs: Essential Readings (2012); Transnational Actors in Central and East European Settings (2008); Issue Brief: American Institute for Contemporary German Studies (2007); Perspectives on Politics (2006); The Catholic Church and the Nation-State (2006); The One, the Few, and the Many (2001); The Protection of Religious Minorities in Europe, (1999), Mitteleuropa: Between Germany and Europe (1998), Religion, State, and Society (1997), American Review of Politics (1997), Tamed Power: Germany in Europe (1997), Conscience (1996), East European Quarterly (1996), and Commonweal (1993). Journal articles and book chapters on religion and politics in the United States in Albany Law Review (2007); Clergy and Politics (2001), Political Science Quarterly (1993), Journal of Church and State (1991), Do Elections Matter, 2nd ed. (1991), and Church Polity and American Politics (1990). Journal articles and book chapters on abortion policy and politics in Conscience (1996) and Do Elections Matter, 3rd ed. (1996); other articles and reviews in various journals.