Reference sources, such as encyclopedias, have short entries, readable entries with links to further reading. They are a good place to start when researching a topic. Here are some online reference sources that may be useful for this class:
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CQ Researcher provides reports written by journalists, footnoted and fact-checked. Full-length articles include an overview, historical background, chronology, pro/con feature, plus resources for additional research. Graphics, photos and short "sidebar" features round out the reports.
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Oxford Scholarship Online offers access to thousands of academic works from the scholarly list of Oxford University Press, covering subjects across the humanities, social sciences, sciences, medicine, and law.