Resources: "Check out some of the websites that relate to your novel, and pick out a book or two that you plan to read, either between now and when you start writing, or to flesh out your world after you've written your first draft."
The 30 Days of World Building site has a large list of books and articles on world building. I've looked at and/or read almost all of them when I've done this exercise before.
What I'm doing now with Howlina is to study Transhumanism. I've been listening to Changesurfer Radio and I've checked several books out of the library.