You will find specialized encyclopedias in the Reference Area on the first floor of the library.
Here's a hint! If the call number of the item begins with REF it will be located in the Reference collection.
Specialized encyclopedias will contain greater detail on your topic. The sub-categories may help you to narrow the scope of your paper. As you read think about questions that further research might help you answer.
Here are some examples of dictionaries avaliable at Viterbo. You can find more by searching the library database.