The employer I interviewed with had me fill out a references sheet during the on-site interview and I didn't have time to get permission beforehand from references. They asked for both personal references and references from my most recent job which I didn't have ready. I ended up using my previous employers as references without their permission.
My question is how should I handle this? Do I tell them, that I used their name as a reference and they might be contacted? Or do I just ignore it and not notify them? What happens if the reference actually didn't want to be a reference?