Rules of Thumb:
Exporting citations will generate a text file in a predefined standard style.
Importing citations will pull in citations from a text file in a predefined standard style.
In Desktop version, select the items to be exported. Choose File>Export (or Ctrl+C) to export.
Mendeley Desktop: Import citations by choosing File> Import> choose format of text file to import.
Mendeley Web: Use Web Importer or bookmarklet.
Go to References>Export> and choose the correct format from the pull down menus.
Go to References>Import> and choose the correct format from the pull down menus.
In Web Zotero, Click on the Export button on the right side, then choose from the menu.
In Zotero Standalone & Firefox Extension, choose File>Export Library>format of your choice.
In Zotero Standalone, choose Import>and then choose file to import into library.
Choose the format you want for exporting your CiteULike library.
Import a formatted txt file or paste snippets from the txt file.