Brill's New Pauly: The NEW PAULY is a Reallexikon or encyclopaedia of the ancient world. It is intended as an aid for the study of Greek and Roman culture and its multifaceted presence in all periods of European and, since the Early Modern period, world history.
Oxford Classical Dictionary: provides coverage of Greek and Roman history, literature, myth, religion, linguistics, philosophy, law, science, art and archaeology, and topics in near eastern studies and late antiquity.
Oxford Dictionary of the Renaissance: Covers the Renaissance in 14th to 17th century Europe, includes coverage of the art, literature, science, culture, philosophy, religion, economics, history, and conflict of the period.
Oxford Reference Online- Classics: Collection contains reference works covering Classical Civilization, Classical Literature, the Classical World and Latin.
Philosopher's Index: Philosophy, ethics, metaphysics, epistemology, logic, aesthetics 1940-
Thesaurus Linguae Graecae (TLG): Digital versions of most literary texts written in Greek from Homer to the fall of Byzantium in AD 1453. Its goal is to create a comprehensive digital library of Greek literature from antiquity to the present era.