Help:Introduction to referencing with VisualEditor/4
Verifiability
Why references are important
Adding references
Automatically or manually
Editing existing ones
Always room for improvement
Reusing references
Some are just really useful
Reliable sources
Which sources are good enough?
Summary
Review of what you've learned
Sometimes you may want to cite the same reference in multiple places on a page.
To do so, click the 
button, and select the "Re-use" tab. This will display a list of all the references currently used in the article.
To find the reference you want to re-use, either scroll through the list, or use the "Search within current citations" bar at the top. Clicking on a specific reference will insert it into the article.
