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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 ...
As an external link: Almost never. As a reliable source: * Sometimes. This website is usually used for past or upcoming media release dates. Certain media such as printed works may have an "official website" that only links to Amazon as the distributor. User submitted reviews on Amazon are not considered reliable, and should not be used.
A citation ideally includes a link or ID number to help editors locate the source. If you have a URL (web page) link, you can add it to the title part of the citation, so that when you add the citation to Wikipedia the URL becomes hidden and the title becomes clickable.
Organic Syntheses and Inorganic Syntheses are considered to be secondary sources rather than primary sources. Websites are normally not considered authoritative but are sometimes appropriate. A few websites which are well regarded include: William Reusch (1999). "index". Virtual Textbook of Organic Chemistry. Michigan State University. Rob Toreki.
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.
Sites that have been used as sources in the creation of an article should be cited in the article and linked as references, either in-line or in a references section. Links to these source sites are not "external links" for the purposes of this guideline, and should not normally be duplicated in an external links section.
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 ...
If there have been two recent secondary sources that contradict each other, then you should attribute the disputed findings. On the other hand, if the findings of one or more recent secondary sources are disputed by one or more secondary sources from many years ago, but not by any recent ones, the recent findings can be stated without attribution.