Thread:Wikiwalker11291/@comment-6697950-20170103220818/@comment-6697950-20170104094019

The classical editor has a preview option. If a reference is broken, you'll see a red warning on the reflist with all the references that are broken. You can use that to either check what references are already on the article, or check if any of the references you added are broken. Alternatively, the classic edittor has a source mode where all references are written out as code. You can use CTRL + F to see if a specific reference name is already used. That's why we have standard reference names.