John Williams's Film Music by 
Music in Words by These are a great place to start. They can give you a basic biography and a few sources to consult. Except in special circumstances, you will not want to cite to these sources in your works cited for an academic paper.
This link opens in a new window This link opens in a new window This link opens in a new windowYour first source for both physical and and electronic books is the Cook Library Catalog. If you really want a book, but cannot find it at Towson, consider looking for it in the USMAI system or ordering it through inter-library loan using WorldCat. Chat or email a librarian if you are having trouble.
Like most academic libraries Cook library uses the Library of Congress cataloguing system. That means that books or scores are grouped together by topic. If you go to where these items are located on the shelf you will probably find other related books.
Below you'll find links to electronic books and scores. Note that most John Williams scores are not in the public domain and therefore are not available through digitization efforts.
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Encyclopedia of Great Popular Song Recordings by 
The Encyclopedia of Film Composers by 
