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What is a Primary vs. Secondary Source
In science, a primary source is usually the result of original research and *most* journal articles are therefore, primary sources. A 'review' article is a secondary source. Most books are secondary sources.
Primary research articles will include sections about:
- methodology - explaining how the experiment was conducted
- results - detailing what happened and providing raw data sets (often as tables or graphs)
- conclusions - connecting the results with theories and other research
- references - to previous research or theories that influenced the research
Here's a link to guide you (the source of the list).