Sometimes you need a definition, or statistic, or basic fact for you paper that you can't find in a scholarly article. What can make this doubly frustrating is that sometimes you can find the fact in Wikipedia, but you cannot use Wikipedia in your paper. (See Using Wikipedia for more on how to use this popular resource effectively.)
You can find specialized encyclopedia and dictionaries in:
Reference Books include encyclopedias, dictionaries, and other works which function as manuals, guides and overviews of your field. Here are some of the reference books which you will find in the Criminology section, HV6000-HV9000.
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Encyclopedia of Serial Killers, 2nd ed. REF HV6245 .N49 2006
World Police Encyclopedia REF HV7901. W64 2006
Prisons and Prison Systems: A Global Encyclopedia REF HV8665 .R67 2006
Sage Dictionary of Criminology REF HV6017 .S24 2006
Encyclopedia of Race and Crime REF HV6789 .E43 2009