Who do I ask for a reference after a layoff? - 6 weeks in

The company closed and I am not sure how to reach former colleagues. This is my first time dealing with any of this. HR only confirms titles and dates. Who did you use?

Use a professional network to find a former manager. Many will still write a note.

Thanks for writing this out. I went through something close to it last year, and it settled down once I kept a simple log of every call and form.