It is possible to see who is linked to a source via citations. This can be done from the “Backlinks” section on the source panel:
Click on the “>” button next to the Backlinks, if it isn’t showing. If you have a large database, showing back links can be slow, so these aren’t shown by default—click the check box so they are visible. You can also select the person from the backlinks list and use the “→]” button to go to the fact in the person’s main record.