The Seleucid era or Anno Graecorum (literally "year of the Greeks" or "Greek year") was a system of numbering years in use by the Seleucid Empire and other countries in the ancient Hellenistic civilizations.
- Bickerman, Elias J. (1943). "Notes on Seleucid and Parthian Chronology". Berytus. 8: 73–84.