First and Second Apologies
St. Ignatius of Antioch: The Epistles
Early Christian Writings: The Apostolic Fathers
On First Principles
On the Apostolic Preaching
Ignatius of Antioch & Polycarp of Smyrna (Early Christian Fathers)
On the Incarnation: Saint Athanasius (Popular Patristics)
On the Incarnation
Eusebius' Ecclesiastical History: Complete and Unabridged
The Shepherd of Hermas