Help:Introduction to referencing/verifiability

One of 's key policies is that all article content must be verifiable. This means that a reliable source must be able to support the material. All citations, any material whose verifiability has been excluded or is likely to be questioned and contentious material, whether negative, positive, or neutral, about living people, must include an online quote to a source that directly supports the material. This also means that Wikipedia is not the place for original research, archival findings that have not been published, or evidence from any source that has not been published.

If you are adding new content, it is your responsibility to add source information with it. Material provided without a source is likely to be removed from an article. Sometimes such material will be marked first with a template to give editors time to find and add fonts before it is removed, but sometimes editors will simply remove it because they question its veracity.

This tutorial will show you how to add online citations to articles, and also briefly explain what considers to be a reliable source.