so a i'm trying to get a research position this summer with a prof, and she asked if there was anyone she could email for a reference.... she is looking for knowledge of perl, unix, probability, good programming skills. i have 3 groups of people the references will come from... one knows i know perl and unix, one knows i know probability and statistics, and one knows i have programming skills. so which do i give her? should i just give her as many as possible? or should i reply back and ask what info she wants from the reference?