Need more references but dont have anymore?

I graduated from college back in January. I applied to this job and they wanted references from who I worked for throughout college (not volunteer work, etc - actual work related references). Only had 2 internships, 1 job shadow, and this other random thing I did. So, in all I have 4 references. Only other person I gave was this person who said they would be reference if I needed it, but dont know what happened - apparently they never answered voicemails left. Anyways, instead of 5 it was back to 4. Well, I just got an email now (at 6:30 pm) that said they need more references from work I did throughout college. Apparently they gave good reviews of me but didnt like position they were even though thats who I had while I was there for internships. Problem is that thats all I had since I only had 4 things total. Since I just graduated its not like I have a long list of people who I worked for. Thats the problem since its not like I had been working for 10 years where I can pull people from left and right since I was working for so long.

What should I do? Should I be honest and say that since Im a recent graduate, those are all of the references that I have - those 4 people?