What sources can i use for an extended essay on a comparison between the odyssey and Percy Jackson 2?

I am doing a 4000 word essay on a comparison between these two books and Odyssey being a classic and part of many literature courses, im sure there are some pretty good sources out there which might help in my research. My essay is along the lines of the authors characterization of the protagonists and how this is seen in the way they deal with similar situations. Need some legitimate sources, but more the sake of listing more secondary sources in my bibliography. Thank You.