Christian, ecclesiastical and medieval Latin
Timeo hominem unius libri.
The Vulgate (the Latin translation of the Bible by saint Jerome).
The Bible in Latin: the “New Vulgate” (1979).
The “Patrologia Latina” by Migne.
The “early Church fathers” translated into English.
The Church fathers (both Latin and Greek) translated into English.
The “Glossarium mediae et infimae Latinitatis”, by Charles du Fresne lord du Cange (in Latin).
A dictionary of medieval Latin (Niermeyer, in French and English).