J - How to delete a reference?

I am currently trying to build and delete references in j805. By:

jd 'ref tableA colA tableB colB'

I can create references. But I have problems when trying to delete it. I tried:

jd 'drop ref tableA colA tableB colB'
jd 'dropdynamic ref tableA colA tableB colB'
jd 'delete ref tableA colA tableB colB'

Or even the code in j804:

jd 'dropdynamic reference tableA colA tableB colB'

But those lines of code did not work. Anyone gets an idea how to delete the references? Thanks!