OK, here’s a possiblity, where i only allow two-levels:
<bibliography author-as-sort-order="first-author"
author-shorten-with="———.">
<use-et_al min-authors=“4” use-first=“3”/>
References
Primary Sources
Published Sources
Unpublished Sources
Secondary Sources
…
…
…
I still need to think on this more and see if I can make this more
automated; e.g. whether I should standardize the published/unpublished
groups as a grouping category, and therefore have the software
automatically handle that.
Bruce