The biblatex package offers a lot of power in creating complex bibliographies. It also uses its own style files, separate from the ‘traditional’ ones used by BibTeX (plain, unsrt, etc.). In many ways that is a good thing, as the traditional styles are rather limited. However, lots of people rely on the traditional styles, so emulating them would be useful. There’s an open question on the TeX-sx site asking how to do this: it’s very much a ‘marker’, as the person who asked is one of the biblatex experts! Marco Daniel has now taken up the challenge, with a GitHub repo set up for development of a set of styles. They are still a work in progress, but it looks like the question will soon have an answer!