The resources listed here are not the only ones available. Many others are in print or microform and can be found by searching library catalogs, like CMU's library catalog, or Worldcat, a database of library holding though out the world (though mainly U. S.). Use some of these terms combined with your topic. For this class, sources might be the best bet.
early works to 1800
witches and sources
occult and sources
It's best to have the term sources, etc. searched as a subject to get the most relevant materials.