- Stephanus of Byzantium, s.v. Abrettēnē
- Stephanus of Byzantium, Stephani Byzantii Ethnicorum quae supersunt, edited by August Meineike (1790-1870), published 1849. A few entries from this important ancient handbook of place names have been translated by Brady Kiesling. Online version at the Topos Text Project.
Original source: https://en.wikipedia.org/wiki/Brettia. Read more