When using 'export as citation', you can add additional fields to the export by selecting from the four available options of affiliation of contributors, abstract, ISBN/ISSN, and ePubs persistent URL. Any options selected will be included in the export alongside the default fields.

Note that, with the exception of ePubs persistent URL, the records being exported may not contain the information being selected (e.g. if there is no abstract in the ePubs record then it will not be present in the export results).