HELP! Low Glycemic

I'm trying to find information on Low Glycemic foods/diet. Anyone have any suggestions on books or good notable lists I can refer to? I'm getting confused looking online because some people say you can eat certain foods while others say you it's no good. There are the obvious foods out there that I can pick out low or high but some of the borderline level foods or ones that have different information out there that I just don't know about.