Wikipedia:Reliable sources: Difference between revisions

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This page documents an English Wikipedia content guideline.

Editors should generally follow it, though exceptions may apply. Substantive edits to this page should reflect consensus. When in doubt, discuss first on this guideline's talk page.

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Wikipedia articles should be based on reliable, published sources. This page is a guideline, not a policy: The relevant policies on sources are Wikipedia:Verifiability and Wikipedia:No original research, and additional restrictions in biographies of living people.

Wikipedia:Verifiability says that any material that is challenged or likely to be challenged needs a source, as do quotations, and the responsibility for finding a source lies with the person who adds or restores the material. Sometimes it is better to have no information than to have information without a source.

See Wikipedia:Verifiability/Noticeboard for queries about the reliability of particular sources; see Wikipedia talk:Verifiability for queries about the policy.

What is a reliable source?

Reliable sources are authors or publications regarded as trustworthy or authoritative in relation to the subject at hand. Reliable publications are those with an established structure for fact-checking and editorial oversight. The reliability of a source depends on the context: A world-renowned mathematician may not be a reliable source about biology. However, the author of a source may be reliable outside her/his primary field if s/he has become recognized as having expertise in that secondary area of study. In general, an article should use the most reliable and appropriate published sources to cover all majority and significant-minority published views, in line with Wikipedia:Neutral point of view.

Articles should rely on reliable, third-party published sources with a reputation for fact-checking and accuracy. Sources should be appropriate to the claims made: exceptional claims require exceptional sources. All articles must adhere to Wikipedia's neutrality policy, fairly representing all majority and significant-minority viewpoints that have been published by reliable sources, in rough proportion to the prominence of each view.^[1]

In general, the most reliable sources are peer-reviewed journals and books published in university presses; university-level textbooks; magazines, journals, and books published by respected publishing houses; and mainstream newspapers. As a rule of thumb, the greater the degree of scrutiny involved in checking facts, analyzing legal issues, and scrutinizing the evidence and arguments of a particular work, the more reliable it is.

Academic and peer-reviewed publications are highly valued and usually the most reliable sources in areas where they are available, such as history, medicine and science. Material from reliable non-academic sources may also be used in these areas, particularly if they are respected mainstream publications. The appropriateness of any source always depends on the context. Where there is disagreement between sources, their views should be clearly attributed in the text.

Sources with a poor reputation for fact-checking or with no editorial oversight should only be used in articles about the sources themselves. Articles about such sources should not repeat any contentious claims the source has made about third parties, unless those claims have also been published by reliable sources.

Why use reliable sources?

Sources are used:

To support an assertion made in an article. Sources used in this manner should be directly referenced for the point that is being supported.
To give credit to the source, to avoid the appearance of plagiarism or copyright violations.

If all the sources for a given statement or topic are of low reliability, the material may not be suitable for inclusion in Wikipedia.

Aspects of reliability

Articles should rely on reliable, third-party published sources with a reputation for fact-checking and accuracy. Sources should be appropriate to the claims made.

Relevance

A reliable source should be written purposefully to inform about the subject they are being cited for. When a reference is written specifically for the topic, the editorial focus (and therefore the "fact checking" and resulting "accuracy") is on that topic, helping to ensure the reliability of the information. Passing references, asides and similar statements should not be used.

Scholarship

Wikipedia relies heavily upon the established literature created by scientists, scholars and researchers around the world. Items that fit this criterion are usually considered reliable. However, they may be outdated by more recent research, or controversial in the sense that there are alternative scholarly explanations. Wikipedia articles should point to all major scholarly interpretations of a topic.

The material has been thoroughly vetted by the scholarly community. This means published in peer-reviewed sources, and reviewed and judged acceptable scholarship by the academic journals.
Items that are recommended in scholarly bibliographies are preferred.
Items that are signed are more reliable than unsigned articles because it tells whether an expert wrote it and took responsibility for it.

Exceptional claims require exceptional sources

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WP:REDFLAG

Certain red flags should prompt editors to examine the sources for a given claim.

Surprising or apparently important claims that are not widely known.
Surprising or apparently important reports of recent events not covered by reliable news media.
Reports of a statement by someone that seems out of character, embarrassing, controversial, or against an interest they had previously defended.
Claims not supported or claims that are contradicted by the prevailing view in the relevant academic community. Be particularly careful when proponents say there is a conspiracy to silence them.

Exceptional claims should be supported by multiple high quality reliable sources, especially regarding scientific or medical topics, historical events, politically charged issues, and in material about living people.

Original research is not a reliable source

See No original research

Wikipedia should not be the original source for new research, ideas, interpretations, or analyses. Such original research has not yet been published in a reliable source, and therefore is not suitable for inclusion in Wikipedia. When citing reliable sources, editors must ensure that the sources are not interpreted or analyzed in a novel or non-obvious way.

Biographies of living persons

See Wikipedia:Biographies of living persons#Sources

Material about living persons must be sourced very carefully. Without reliable third-party sources, a biography will violate the No original research and Verifiability policies, and could lead to libel claims.

Self-published sources (online and paper)

Shortcut

WP:SELFPUB

See Verifiability: Self-published sources (online and paper)

Extremist sources

Organizations and individuals that are widely acknowledged as extremist, whether of a political, religious or anti-religious, racist, or other nature, should be used only as sources about themselves and their activities in articles about themselves, and even then with caution.

Claims of consensus

Claims of consensus must be sourced. The claim that all or most scientists, scholars, or ministers hold a certain view requires a reliable source. Without it, opinions should be identified as those of particular, named sources.

Convenience links

See Wikipedia:Convenience links#Reliability

The term "convenience link" is typically used to indicate a link to a copy of a resource somewhere on the Internet, offered in addition to a formal citation to the same resource in its original format. Such links are unique in how reliability is applied. It is important to ensure that the copy being linked is a true copy of the original, without any comments, emendations, edits or changes. When the "convenience link" is hosted by a site that is considered reliable on its own, this is relatively easy to assume. However, when such a link is hosted on a less reliable site, the linked version should be checked for accuracy against the original, or not linked at all if such verification is not possible.

Examples

See Wikipedia:Reliable sources/examples for examples of the use of statistical data, advice by subject area (including history, physical sciences, mathematics and medicine, law, Business and Commerce, popular culture and fiction), and the use of electronic or online sources.

External links

How to Read a Primary Source, Reading, Writing, and Researching for History: A Guide for College Students, Patrick Rael, 2004.
How to Read a Secondary Source, Reading, Writing, and Researching for History: A Guide for College Students, Patrick Rael, 2004.

Footnotes

^ Tiny-minority views and fringe theories need not be included, except in articles devoted to them.

[1] Tiny-minority views and fringe theories need not be included, except in articles devoted to them.

[1]

@@ Line 32: / Line 32: @@
 {{see|Wikipedia:Verifiability}}
 Articles should rely on reliable, third-party published sources with a reputation for fact-checking and accuracy. Sources should be appropriate to the claims made.
+===Relevance===
+A reliable source should be written purposefully to inform about the subject they are being cited for. When a reference is written specifically for the topic, the editorial focus (and therefore the "fact checking" and resulting "accuracy") is on that topic, helping to ensure the reliability of the information. Passing references, asides and similar statements should not be used.
 ===Scholarship===