I have a bibliography of about 500 citations that I imported from readcube. However most (but not all) the author names imported for some reason as two fields - first name, last name, so if I try to export a bibliography it comes out wrong, as I want it to be sorted alphabetically by author last name.

I see for each reference I can click the author name field to switch to two fields, and this switches it to last name, first name format.

But to go through each reference, doing this for every author of every publication, for 500 publications, will take forever!

Surely there must be a way to switch this for all references at once? But I can't find a way to do it. Hopefully someone can help me?

Thanks so much!!