Major publications include:
Einführung in die Politikwissenschaft7 (with Theo Stammen)
Vergleichende Politikwissenschaft4 (with F. Müller-Rommel)
Literaturführer Politikwissenschaft (with S. Quenter)
Tradition and Change in Kenya; Political Stability and Development (with Rainer Siegler);
Poverty and Development (with Norbert Kersting)
Conditions of Authoritarianism and Democracy in Europe, 1919-1939, 2 vol.(with Jeremy Mitchell)
Perspectives of Democratic Consolidation in Eastern Europe (with Raivo Vetik)
Empirische Demokratieforschung
Perspektiven der Demokratie (with H.-J. Giegel);
Democratization – The State of the Art2
Numerous articles in refereed journals including Comparative Politics, Comparative Political Studies, European Journal for Political Research, International Journal of Comparative Sociology, Journal of Commonwealth and Comparative Politics, Acta Politica, Revue Française de la Politique Comparée, Journal of Post-Communist Studies, Historical Social Research, Law and State, Politische Vierteljahresschrift, Soziologische Revue, Taiwan Journal of Democracy.
Numerous contributions to edited volumes