Fellow student doesn't share progress in joint paper for coursework - how should I react?
The first thing I would do is to try contacting your partner again. You've said you already told him that you prefer a more cooperative style, but perhaps you should can be clearer about this. For example, if you say &quot;I think you aren't communicating well, I need you to cooperate more&quot;, this is ambiguous and could possibly be interpreted as an attack on his working style. Instead, you can try to give more concrete suggestions. For example, setting up weekly meeting times for both of you to sit down together and talk about the paper and what you need to do next. You could also suggest setting up a google docs or dropbox etc. where both of you have access, so that you can both edit the document and see the changes the other has made.
If this still doesn't work, I would consider the cost/benefit of the next steps. You can escalate by going to the professor, but this isn't necessarily in your best interest, even if you don't like working with your partner. You say that there are formatting/style issues, and broken references, but to me these sound like minor issues that can be fixed pretty easily. It also sounds like your partner is doing a lot of work on the paper, which is good because sometimes you might get a partner who does nothing or does everything at the very last minute.
If you do decide to go to professor, you should understand that if you can't fix the group, the professor isn't going to be able to either. Maybe if your partner is ghosting you the professor can force the two of you to sit in the same room together, but beyond that they can't do a whole lot. Your professor is also not going to grade you easier because you complain about the group to them. Really the only thing the professor can do is possibly give you the option of working by yourself for the rest of the project (but they won't necessarily allow this). But of course, then you'll be out of a partner altogether.