While Wikipedia can sometimes be a good starting point, it is not considered "scholarly." If you are you having trouble distinguishing between the peer-reviewed/scholarly journals from the trade publication or popular magazines, Below is a link to a document that will help explain the differences.
REVIEW VERSUS RESEARCH
It is also important to be able to distinguish between review articles and research articles. A review article’s primary purpose is not to present new research, but to summarize, analyze, discuss, and provide an overview of previously published work on a topic. A research article is designed to present new research, methods, and/or findings. Research articles often employ the IMRAD (Introduction, Methods, Research, and Discussion) format. Below are a few articles of interest on this topic.
Check out these databases if you are looking for scholarly articles
Below are some databases that will be more relevant/useful for the "law" and "criminal justice" topics.
One of the primary online legal research services for lawyers and legal professionals in the United States. Information resources on Westlaw include more than 40,000 databases of case law, state and federal statutes, administrative codes, newspaper and magazine articles, public records, law journals, law reviews, treatises, legal forms and other information resources.
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If you need a better understanding of Boolean logic and searching, here are a few resources to help:
Or, sometimes called a Survey of the Scholarship.
A literature review is a text written by someone to consider the critical points of current knowledge including substantive findings, as well as theoretical and methodological contributions to a particular topic. Literature reviews are secondary sources, and as such, do not report any new or original experimental work. Also, a literature review can be interpreted as a review of an abstract accomplishment.
Most often associated with academic-oriented literature, such as a thesis or peer-reviewed article, a literature review usually precedes a research proposal and results section. Its main goals are to situate the current study within the body of literature and to provide context for the particular reader. Literature reviews are a staple for research in nearly every academic field.