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a list of sources that have never been discussed, or whose reliability should be obvious to most editors; a list of primary, secondary, or tertiary sources; a list of independent or affiliated sources; a list of self-published or traditionally published sources; a representative sample of all sources used on Wikipedia or all sources in existence
Wikipedia articles should be based on reliable, published sources, making sure that all majority and significant minority views that have appeared in those sources are covered (see Wikipedia:Neutral point of view). If no reliable sources can be found on a topic, Wikipedia should not have an article on it.
If reliable sources cannot be found for challenged material, it is likely to be removed from the article. Sources are also required when quoting someone, with or without quotation marks, or closely paraphrasing a source. But the need to cite sources is not limited to those situations: editors are always encouraged to add or improve citations ...
You should always try to use the best possible source, particularly when writing about living people. These are general guidelines, but the topic of reliable sources is a complicated one, and is impossible to fully cover here. You can find more information at Wikipedia:Verifiability and at Wikipedia:Reliable sources. There is also a list of ...
Official reports, letters and eyewitness accounts. Primary material may require interpretation, interpolation, extrapolation or corroboration each of which would constitute original research. Wikipedia articles may use primary sources only if they meet the preceding principles and then only to make purely descriptive claims about the topic.
This is an essay on the Wikipedia:Reliable sources guideline. It contains the advice or opinions of one or more Wikipedia contributors. This page is not an encyclopedia article, nor is it one of Wikipedia's policies or guidelines , as it has not been thoroughly vetted by the community .
This page in a nutshell: Cite reviews, don't write them. Appropriate sources for discussing the natural sciences include comprehensive reviews in independent, reliable published sources, such as recent peer reviewed articles in reputable scientific journals, statements and reports from reputable expert bodies, widely recognized standard textbooks written by experts in a field, or standard ...
Wikipedia's no-original-research policy allows routine calculations based on data from reliable sources. Routine calculations frequently involve converting units, rounding to appropriate levels of precision for the article, describing quantitative relationships in words, and other simple methods that both accurately describe the information ...