Most of the reference material in Church History can be found in the Religious Studies/Philosophy Library located on the 3rd floor of Mullen Library. These items are non-circulating.
Materials specific to the history of the Catholic Church are located in BX 1-8399.
These Dictionaries and Encyclopedias can be quite useful for beginning research about Church History or Catholocism, or for clarifying terms and gaining background knowledge. Many entries include bibliographies.