Sometimes the same reference is found when using different databases. Duplicate records can be identified by clicking on Organize and then choosing Find Duplicates.
1. Click on Organize and then select Find Duplicates. EndNote will display a list of possible duplicate records.
2. Select the duplicate record(s) to be deleted by clicking in the check box of one of the duplicate record(s) and click the Delete button at the top of the list of references. The duplicate references will be deleted.