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A literature review can be a type of a review article. In this sense, it is a scholarly paper that presents the current knowledge including substantive findings as well as theoretical and methodological contributions to a particular topic. Literature reviews are secondary sources and do not report new
Prefer recent reviews to older primary sources on the same topic. If recent reviews do not mention an older primary source, the older source is dubious. Conversely, an older primary source that is seminal, replicated, and often-cited may be mentioned in the main text in a context established by reviews.
Among genealogists, a primary source comes from a direct witness, a secondary source comes from second-hand information or hearsay told to others by witnesses, and tertiary sources can represent either a further link in the chain or an analysis, summary, or distillation of primary and/or secondary sources. In this system, an elderly woman's ...
In scientific literature, a primary source, or the "primary literature", is the original publication of a scientist's new data, results, and theories. [8] In political history , primary sources are documents such as official reports, speeches, pamphlets, posters, or letters by participants, official election returns, and eyewitness accounts.
If a primary source is cited by few or no reliable sources outside the originating lab, the primary source may be removed as not reporting an important result. Wikipedia does not apply any special emphasis to breaking news, but seeks an overall survey of the literature as it has been synthesized by the experts in a field. Tertiary sources can ...
An individual primary source may be flawed, such as being a clinical trial that uses too few volunteers. There have been cases where primary sources have been outright fraudulent. Furthermore, a single primary source may produce a different result to what multiple other primary sources suggest, even if it is a high-quality clinical trial.
Review articles come in the form of literature reviews and, more specifically, systematic reviews; both are a form of secondary literature. [21] Literature reviews provide a summary of what the authors believe are the best and most relevant prior publications. Systematic reviews determine an objective list of criteria, and find all previously ...
Primary literature, on the other hand, is bulkier but also less error-prone and easier to verify because you can directly go to the source instead of hoping from one review which cited another review which finally badly cited the original experiment.