Crossover Wiki:Citing sources

Within articles, there may be information that is disputed. Having a citation, also known as a reference, for this information helps to provide proof.

Generally, information that would be helped by having a way to verify would have a reference. Any information that is not easily found within the mentioned work needs a reference for proof. This includes content that was only in the work for a limited time, content that was removed from the work, and confirmations outside of any work such as interviews or official websites. Note that this does not mean that only that kind of information should have a reference, as generally any disputed information would have a reference. If in doubt, it's better to add a reference just in case.

References should be to reliable sources.

How to make a reference
A reference is made by adding  just after the piece of information that the reference is for. Within those tags, the following information should be included if known:
 * URL of the web page
 * name of the author(s)
 * title of the article
 * name of the website
 * date of publication
 * date the web page was accessed (required if the publication date is unknown)

You should also have a References section that contains, which will list every reference used in the page.