"Exact but not exacting, this is a fine work of overview and analysis; it makes an excellent contribution to the literature on power and freedom." (Philip Pettit, William Nelson Cromwell Professor of Politics, Princeton University)
"In this work, the author assumes the task of a logical clean-up an extremely valuable contribution to the promotion of scientific rigour and clarity in political scholarship." [This book] "gives the reader orientation in a conceptual jungle." [It is] "an excellent analysis of the relationships between normative and social power." (Ernesto Garzon Valdes, Prof. em. of Legal Philosophy, President of The Tampere Club)
"A genuinely pioneering contribution insofar as the author to my knowledge: for the first time ever succeeds in giving a conceptually rather clear profile to a descriptive-analytic and normative understanding of the phenomenon of influence and in elucidating again, by way of thorough and profound analysis that this is much more than an academic glass-bead game, because our understanding of such essential normative foundations of political theory as freedom and equality is inextricably linked to the concepts of power and influence, and because this is the only way how we can come to see the fundamental obstacles to a coherent interpretation and institutional realization of the idea of the democratic Rechtsstaat." (Rainer Schmalz-Bruns, Prof. of Political Theory, Darmstadt University of Technology)