Book excerpt: In Criminological Theories, the noted criminologist Ronald Akers provides thorough description, discussion, and appraisal of the leading theories of crime/delinquent behavior and law/criminal justice - the origin and history of each theory and its contemporary developments and adherents. Akers offers a clear explanation of each theory (the central concepts and hypotheses of each theory as well as critical criteria for evaluating each theory in terms of its empirical validity). Researchers and librarians, as well as general readers, will find this book a very useful tool and will applaud its clear and understandable exposition of abstract concepts.