Wikipedia:Citation needed

If your work has been tagged, please provide a reliable source for the statement, and discuss if needed.

You can add a citation by selecting from the drop-down menu at the top of the editing box.

Not all tags get addressed in a timely manner, staying in place for months or years, forming an ever-growing Wikipedia backlog—this itself can be a problem.

Best practice recommends the following: Before adding a tag, at least consider the following alternatives, one of which may prove much more constructive: There are 540,403 articles with "Citation needed" statements.

The tool Citation Hunt makes that easier by suggesting random articles, which you can sort by topical category membership.