As explained in About Wikipedia, "if you add information to an article, be sure to include your references, as unreferenced facts are subject to removal." It is best to use inline citations so that other editors and readers can verify the information you add. Also, make sure that the sources you use are trustworthy and authoritative.

The easiest way to create an inline citation is using footnotes. You can create footnotes with Wiki markup (under the edit box on your Wiki GUI) by adding

• <ref>YOUR SOURCE</ref> ref tags around your source, and
• {{Reflist}} or <references/> under the heading ==References== near the bottom of the page.

If your source is a website, you should create an external link to the website address. Do not use other Wikipedia articles as sources.

To create an external link to your source, put the website address (URL) in square brackets after the text you add, such as

• <ref>[http://www.google.com Google search engine]</ref>

It is a good idea, though not required, to provide a short description just after the external site address. This description will be displayed in the reference list as the title of the external site, rather than the actual URL of the site.

To cite a webpage without giving a description, you can just give the URL and enclose it in ref tags, for example

• <ref>http://www.google.com</ref>

There are templates allowing to format references, see Wikipedia:Citation templates.

External web pages should normally not be linked in the article body outside references.