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In general, there are three types of resources or sources of information: primary, secondary, and tertiary. It is important to understand these types and to know what type is appropriate for your coursework prior to searching for information.
It's sometimes difficult to distinguish among these three types and they do vary by discipline and subject..
When searching for articles, know what type of periodical it is. This is because each type has its own purpose, intent, audience, etc.
Types: