With VBA, is it possible to open the window displayed when adding a new IEEE reference in Word (2013-2019), and access the fields' filled in values on closing it?
It's the window which asks for the publication type (book, journal...) and based on that presents different TextBoxes to be filled in (authors, title, publisher...)
Perhaps along these lines (i.e. not working code, just an outline):
If it turns out that the most recently added Source is not always this one
then you might have to do something like
Without further testing, it's not even obvious that the new Source's Tag/Tag Name is unique.
Notes: