Fred I. Greenstein 
Personality and Politics 
Problems of Evidence, Inference, and Conceptualization

Fred Greenstein, an acknowledged authority in this field, lays out conceptual and methodological standards for carrying out personality-and politics inquiries, ranging from psychological case studies of single actors, through multi-case analyses of types of political actors, to aggregative analyses of the impact of individuals and types of individuals on political systems and processes.
Originally published in 1987.
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