For all those interested in ancient Mesopotamian religion, I recommend the Ancient Mesopotamian Gods and Goddesses Project website. It’s being produced by one of my alma maters, the University of Pennsylvania.
The project describes itself as a “website [that] offers information about the fifty most important gods and goddesses and provides starting points for further research.”
Here’s the link to the Anunna/Anunnaki page. Nicely done with bibliography links. (Sorry, Sitchin didn’t make the cut – this is real primary text research, not fantasy land).