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The Diagnostic and statistical manual of mental disorders, 5th ed : DSM-5 will give you the clinical diagnostic criteria for addiction(s).
The American Society of Addiction Medicine (ASAM) provides both a short and a long definition of addiction.
You will need to search directly in our library resources for your topic. Here are your "best bet" tools for addiction research in our collection.
Addiction is a cross-disciplinary topic and you may want to explore some of our other research guides, as well.