Exporting/importing your citation library between EndNote, RefWorks and Zotero should be a simple process. Below are detailed instructions on how to move your citation library from one citation management tool to another.
Export RefWorks to Endnote
Login to your RefWorks database if you have not already done so.
Click on References and Export at the top of the screen.
Click in the radio button for "All References or References From": to specify a folder.
Select Bibliographic Software (EndNote, Reference Manager, ProCite) from the Export Format: choices.
Click on Export to Text file....
Click on File and Save As
Type your disk drive, the filename in the File Name box.
Select Text from the Save As type dropdown menu.
Click on Save.
Next open your EndNote Library and click on File and Import.
Click on Chose File at Import Data File: and select your text file.
Select Refman RIS from the Import Option drop down menu.
Click on Import.
Export Zotero to RefWorks
Highlight (select) the Zotero records that you wish to export.
Right-click on the selection and, from the menu bar, select "Exported selected items".
For the Export format choose RIS
After exporting from Zotero, within RefWorks from the References pull-down menu select Import.
Using the pull-down menu set the Import Filter Data to RIS Format, from the Database pull-down menu select RIS. Browse to locate the saved txt file (check the Download Folder). Then click Import.
To view your imported items click the view Last Import Folder button.