This is an encyclopedia, so remember that it's a necessity to include references listing websites, newspapers, articles, books and other sources you have used to write or expand articles. All additions and corrections should be based on reliable, third-party, published sources with a reputation for fact-checking and accuracy. These sources should verify the information but you must not copy and paste text you find anywhere, except for short quotations. New articles and statements added to existing articles may be deleted by others if unreferenced or referenced poorly or if they are copyright violations.
A screencast that walks through the essentials needed in citing your sources, part 2
Generally references are added directly after the facts they support, at the end of the sentence and after any punctuation. Wikipedia permits editors to use any citation system that allows the reader to understand where the information came from, and strongly encourages use of inline citations to do so. Common methods of placing inline citations include footnotes, shortened footnotes, and parenthetical references.
There are three basic methods to add a reference into the article text. You may use any one, or a combination of methods:
That text should be immediately below the section heading == References ==. If that section does not exist, you will need to add it (both the heading and either the "Reflist" or "references" text above). Place the new section near the bottom of the article, just above the "External links" section (if that exists).
Once you have saved your edit, the ref tags will convert your citation of a source into a footnote reference (like this one), with the text of the citation appearing in the References section at the bottom of the article.
If the citation you are placing between the ref tags as your source is a link to an external website, place the website address (URL) within single square brackets along with some text, which the reader will see as a link. For example:
<ref>[http://www.nytimes.com/article_name.htmlArticle in ''The New York Times'']</ref>
Though it is not required, it is highly recommended to provide more information than that in a footnote. Here is a more complete footnote:
<ref>Name of author, [http://www.nytimes.com/article_name.html"Title of article"], ''The New York Times'', date</ref>
It is not recommended to use bare URLs for your external link references, because of link rot.
Although material that is from external websites is a common reference source, Wikipedia has no preference for online sources. If your source is a book, journal, magazine, newspaper article, documentary or other source, then you would place identification information about that source between the ref tags.
For a more visual summary, see the guide below (click show on the right hand side).
Two separate citations.<ref>Citation text.</ref><ref>Citation text2.</ref>
Multiple<refname="multiple">Citation text3.</ref>citation<refname="multiple"/> use.<refname="multiple"/>