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That extensive German title may be intimidating but IBZ-Online (or for non-Germanophiles, International Bibliography of Periodical Literature in the Humanities and Social Sciences-Online) is an index for scholarly research that no self-respecting European or American research library has been without for over a hundred years. Founded by Felix Dietrich in 1899, IBZ is also known as "The Dietrich" in Europe. Publications from 40 countries in more than 40 languages are covered. lBZ-Online provides access to citations for over two million journal articles. with some 120,000 entries from 6000 periodicals added each year.
McKeigue, E. “IBZ-Online: Internationale Bibilographie der Geistes-und Sozialwissenschaftlichen Zeitschrigtenliteratur.” (Review) Library Journal 1 April 2004.