Be careful about being too obviously rude, these peole know each other, and will probably also be working together when you have got your qualification and are off to pastures new, your new sup probably knows her quite well, and may have a different impression, that is just the way it goes. Are the refs very obscure? Have you asked the librarian? They may know, or know how to find out without asking this other person, tell them your problem and they might even enjoy the challenge, it would make a change from the usual stuff they have to deal with.