Reference works may be general or discipline-specific. Types include:
They are useful during the early stages of your research to provide foundational Information, such as
The Cambridge Medieval History.
Ref D117.C3 Porter. (8 volume set).
Dictionary of the Middle Ages.
Ref D114.D5 1982 Porter (13 volumes).
Encyclopedia of Medieval Literature.
Ref PN669.R88 2006.