Getting Started
Try ESearch for a quick search of a little of everything. You can then limit your results using the filters. Find tips on searching for articles in ESearch here.
An Overview of Scientific Literature
Scientific information exists in different formats including: articles, books, and data. Sources can be primary, secondary, or tertiary. Authors of primary sources analyze data. Secondary and tertiary sources interpret and summarize other sources. Primary sources are often the most up-to-date, but can be difficult to read and understand. Secondary and tertiary sources are often easier to understand, but have undergone additional interpretation.
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Primary Sources Original research, evidence, and analysis Examples: Research articles, Patents, Research data, Lab notes, Conference papers, Clinical trials Search tip: Did the authors themselves collect or analyze data? If the answer is yes, it is probably primary research. |
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Secondary Sources Summaries, evaluations, or interpretations of others' original research Examples: Review articles, Book reviews, Annotated bibliographies Search tip: Scholarly review articles are usually easier to understand than the primary literature. Try adding the term "review" to your search strategy to find them. |
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Tertiary Sources Collections and summaries of primary and secondary sources Examples: Reference books, Dictionaries, Encyclopedias Search tip: Try using the content type filters in ESearch to limit to "Reference." |
