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- Chronology of World History: Prehistory - AD 1491 (ABC-CLIO, 1999) [Ref. D11 .M3]
- Charts of Ancient and Medieval Church History (Zondervan, 2001) [examples]
- History World Timelines
- New Catholic Encyclopedia, 2d ed.
- New Westminster Dictionary of Church History (Westminster, 2008) [Ref. BR95 .W496]
- Oxford Dictionary of the Christian Church, 3rd ed. revised
- The Cambridge History of Christianity
- vol. 1: Origins to Constantine [270.1 O692o]
- vol. 2: Constantine to c. 600 [270.2 C7585c]
- vol. 3: Early Medieval Christianities, c. 600 - c. 1100 [BR252 .E27]
- vol. 4: Christianity in Western Europe, c. 1100 - c. 1500 [BR252 .C36]
- Creeds and Confessions of Faith in the Christian Tradition, vol 1 (ancient, Eastern, and medieval creeds) [Ref. BT990 .C64]
- For more reference sources consult: Reference Universe
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- The Church in Ancient Society: From Galilee to Gregory the Great, by Henry Chadwick, 2001
- Christian Beginnings: From Nazareth to Nicea, by Geza Vermes, 2013
- A History of the Medieval Church, by Margaret Deanesly, 1969
- Women in Christianity, by Hans Kung, 2010
- The First Crusade and the Idea of Crusading, by Jonathan Riley-Smith, 2003.
- A History of Medieval Heresy and Inquisition, by Jennifer Deane, 2011
- Jan Hus: Religious Reform and Social Revolution in Bohemia, by Thomas Fudge, 2010
- For more ebooks, search Ebrary and Oxford Scholarship Online
Periodical Databases
- ATLA [e.g."What Evangelicals and Liberals can Learn from the Church Fathers"]
- L'Annee Philologique [e.g. "Ëarly Christian Belief in a Corporeal Deity"]
- International Medieval Bibliography [e.g. "The Exile and Recall of Arius"]
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