What are the best Harry Potter scholarly literature?

I am doing a paper on Harry Potter and the Sorceror's Stone for an English course. I am supposed to have four scholarly literary sources to quote from outside of the book itself. I need one topic to discuss such as a certain theme, a character, a scene, those sorts of things. I would like to do it on Hermione, but I can not find many good sources of information.

Books on the Harry Potter books

There are a few serious works on the Harry Potter books among all the ones for fans (links are to Amazon):

The Ivory Tower And Harry Potter: Perspectives On A Literary Phenomenon

Reading Harry Potter: Critical Essays

Harry Potter's World: Multidisciplinary Critical Perspectives

When I answer this question I usually think about the book first and then you can think about some of your most favourite characters. My favourite character is Hermione Granger and therefore I always follow her ideas and concerns about her friends and mine. I know that sometimes you get so much stress that you can do stupid stuff but you know if you do that you can get help. Hermione Granger is my example.