Late antiquity : a guide to the post classical world
Dictionary of Classical Mythology
Encyclopedia of Society and Culture in the Ancient World by 
The Edinburgh Companion to Ancient Greece and Rome
Who's Who in Classical Mythology, Routledge
The Oxford History of Greece and the Hellenistic World
A history of Greece to the death of Alexander the Great
Encyclopedia of the Ancient World (Brill's New Pauly)
The Oxford Classical Dictionary
Encyclopedia of Archaeology
The Cambridge Illustrated History of Ancient Greece
Cambridge Ancient HistoryD - World History and History of Europe, Asia, Africa, Australia, New Zealand, etc.
Subclass D - General History
D 1-24.5 General
D 25-27 Military and naval history
D 31-34 Political and diplomatic history
D 51-90 Ancient History
Subclass DF - History of Greece
DF 10-289 Ancient Greece