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American Society of Criminology
International organization concerned with criminology, embracing scholarly, scientific, and professional knowledge concerning the etiology, prevention, control and treatment of crime and delinquency.
http://www.asc41.com/
British Society of Criminology
Aims to further the interests and knowledge of persons engaged in any aspect of teaching and research, and advance public education about crime, criminal behaviour, and the criminal justice systems.
http://www.britsoccrim.org/
Crimetheory.com
Educational resource for the learning and teaching of theoretical criminology.
http://www.crimetheory.com/