When you use the library catalog, do a search for Jack the Ripper. When you're pulling a book you found in the library catalog off the library shelf, look at the books around it. Books in academic libraries are shelves by subject area, so you can find other books on the same subject nearby.
These books have been recommended by Dr. Wraight for your Jack the Ripper research. Each book has a UMDearborn Library link (to borrow the book from the library) and an Amazon link (to purchase the book from amazon.com).