Write-N-Cite is a utility that allows users to run an abbreviated version of RefWorks in Microsoft Word. You can access your references by folder (or sub-folder), by quick search or by all references with the ability to sort by author, title or year. With Write-N-Cite, you can cite references in a manuscript with just a click and watch your paper format instantly including in-text citations, footnotes and your bibliography. The utility installs a RefWorks tab in the MS Word ribbon or you can access it from the References tab in Microsoft Word.
To determine which is the best Add-In for Microsoft Word, please refer to this page: http://support.proquest.com/apex/homepage?id=kA140000000TgyjCAC&l=en_US
NOTE: If you are using Mac AND Word 2016, your only option is to use RefWorks Citation Manager.