Patrologia Latina (ProQuest)
Electronic version of the Patrologia Latina, a collection of works by church fathers. From Tertullian (around 200 AD) to the death of Pope Innocent III in 1216. Published by Jacques-Paul Migne between 1844 and 1855. With original texts, introductions, critical comments and indices. Interesting for those who are proficient in Latin and study the Middle Ages.