The Duchess of Malfi: The Principal Characters - A study of John Webster's revenge tragedy, The Duchess of Malfi, focusing on the characters and their roles. - http://www.literature-study-online.com/essays/webster.html
Lycanthropy in The Duchess of Malfi - Site by students on why Ferdinand, the cruel, incestuously-inclined brother of the Duchess, turns into a werewolf. - http://virtual.park.uga.edu/~cdesmet/eliza/MALFI.HTM