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Secondary sources help you find and understand the law. They are not the official versions of the law. Still, courts sometimes use them to explain words or ideas. They include legal dictionaries and encyclopedias, journal articles, and treatises. Practice aids, self-help materials, and finding tools are also included.
It is often best to start research with a secondary source instead of the official law. Secondary sources often pull together laws of different types about a shared subject. This makes them good resources for learning quickly before beginning deeper research.