Dictionary of Early Christian Literature.
Edited by Siegmar Dopp and Wilhelm Geerlings.
Crossroad, 2000.
Articles are mostly about individuals (many not found in other dictionaries), but also include specific works and genres of literature. Thorough bibliographies of editions and secondary works in the major Western European languages.
Available online on the Internet Archive, a trusted source, but one for which it is necessary to create a free account and login.