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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 ...
You can "deep link" to a section of an article (or other Wikipedia page), using a hash character (#), then the section's title, with underscore characters (_) replacing spaces.
Find the page which contains the section you want to refer to. Click on "Permanent link" in the "Toolbox" in the lefthand sidebar. Go to the page's Table of Contents. Right-click on the name of the section you want to use, where it appears in the Table of Contents, and select "Copy link address". The section link you want is now in your clipboard.
External links use URLs to link directly to any web page. External links are enclosed in single square brackets (rather than double brackets as with internal links), with the optional link text separated from the URL by a space (not a "|" as with internal links). When rendered, external links are followed by an external link icon. For example,
However if you want to link to an outside website, or to certain specially generated Wikimedia pages (such as a past version of an article), it is necessary to provide the full URL. This is done using external link syntax. There are three forms of external link syntax:
For example, if the official website of a now-defunct company is no longer functional, then a good archived copy could be preferable to no link; however, if the article links to a page with many relevant photos of the subject, then it would usually be better to change the link to a different website that also has many photos than to link to an ...
Some fields (such as a web address, also known as a URL) will have a icon next to them. After filling in this field, you can click it to handily autofill the remaining fields. After filling in this field, you can click it to handily autofill the remaining fields.
Here readers would see the link displayed as particle physics, not the hidden reference to the page Parton (particle physics), unless they followed the link or inspected the target title e.g. by mousing over it. If a physical copy of the article were printed, or the article saved as an audio file, the reference to the parton model would be lost.