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External links and references are two important elements of Wikipedia that newcomers sometimes find trouble with. This page is designed to cover only the technical aspects of linking and referencing; it is essential that editors also familiarize themselves with Wikipedia:External links, Wikipedia:Reliable sources and Wikipedia:Citing sources, as well as Wikipedia's various other policies ...
Note that the standards for WP:External links and WP:Reliable sources are different, so that a web page might be acceptable as an external link, but not as a reliable source, or vice versa. Also note that this page does not prescribe any recommendations of what action to take if one encounters any of these sites linked within articles.
Whether a source is primary, secondary or tertiary can depend on the topic that an article is covering. For example, the summary for policy makers from the IPCC is a secondary source for the article Global warming but it would be a primary source if used for the article Intergovernmental Panel on Climate Change. Similarly, a book review in a ...
A secondary source contrasts with a primary, or original, source of the information being discussed. A primary source can be a person with direct knowledge of a situation or it may be a document created by such a person. A secondary source is one that gives information about a primary source.
A result or statement from a reliable secondary source should be included without attribution if it is not disputed by any other recent secondary sources. You should do a search to check that the secondary source you are citing is the most up-to-date assessment of the topic.
Secondary sources are accounts at least one step removed from an event or body of primary-source material and may include an interpretation, analysis, or synthetic claims about the subject. [2] Secondary sources may draw on primary sources and other secondary sources to create a general overview; or to make analytic or synthetic claims. [3] [4]
You can use site: to search for web domains, top level domains, and directories that are not more than two levels deep. You can also search for webpages that contain a specific search word on a site. To see webpages about heart disease from the BBC or CNN websites, type "heart disease" (site:bbc.co.uk OR site:cnn.com).
Interwikimedia links bind the project to sister projects such as Wikisource, Wiktionary and Wikipedia in other languages, and external links bind Wikipedia to the World Wide Web. Appropriate links provide instant pathways to locations within and outside the project that can increase readers' understanding of the topic at hand.