There are many books that can be useful to you. Some are in the Reference Collection (REF), which is located on the fourth floor of the Library. Other books are in the Main Stacks or online. Roman history is mostly in the D classification.
The Cambridge ancient history. Volume 12, The crisis of Empire, AD 193-337 by 
The Oxford classical dictionary by 
The Oxford history of the classical world by 
The Oxford history of the Roman world by 
The Roman Empire : Augustus to Hadrian by 
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