Remember - you need two additional sources beyond just your novel. Take a look at some suggestions below.
Are you writing about theme?
Are you writing about characterization?
Research the culture or society highlighted in the book:
If you're going to connect this text to another similar text within the same genre, culture or society:
Researching imagery or figurative language?
Research a historical time period:
What if you want to look into how the author structured his/her text?
Biographical information of author:
Sparknotes, Cliffsnotes, Shmoop (to cite: Website-->Webpage)
Has the novel been made into a TV show or movie?