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A primary source documents a clinical trial, case study, cohort survey or other activity firsthand. Primary sources are usually written by the person or team who did the research or conducted the study. It may include peer-reviewed journal articles as long as they have been written by the actual researcher(s).
Use this link to search for the original reports and details of Clinical Trials:
Your instructor may ask you to use only scholarly resources for your paper.
Scholarly (peer-reviewed) sources include books and articles published in scholarly journals, encyclopedias, and books.
Non-Scholarly sources include websites, magazines, newspapers, and books that undergo no expert review prior to publishing.