I am creating an online class for a fee. It will consist of power point presentations and recorded scripts. The written bullets are my own words, but much of the recorded script is read from books articles, etc. I have complete references for all my matrial listed at the end of each module, however I do not state the reference as I am speaking. All of the information is medical factual infomation. Is this a copyright violation?

I think a lot will depend on what proportion of each article or book you are reading.

Go to the U.S. Copyright Office's site and read what they have to say about Fair Use.

FarmBoy

Why are you reading stuff from books to what is supposed to be a class? As a former student and teacher, I can tell you that nothing is more boring than listening to someone read. If the information is factual, you should retell it in your own words AND reference it so students can read further. If the info is in reference to something in dispute, then you can quote, but I was taught that a quote should only be used if there is something about the wording itself that is important. Otherwise, just restate and use a footnote/reference.