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This online encyclopedia is "a comprehensive compendium of theories of crime". It includes the historical development of these theories in addition to the most recent theories.
The Blackwell Encyclopedia of Sociology is the reference for students, researchers, librarians, and academics in the field. Articles are written by an international array of experts in the area. It includes over 1800 entries including key concepts, introductions to sociological theories and research, and extensive bibliographies for each article. It is regularly updated.