Acta Sanctorum
Analecta hymnica
L'Année Philologique
Cambridge Ancient History
New Cambridge Medieval History
Database of Latin Dictionaries
Digital Loeb Classical Library
Dyabola: Census of Antique Art
International Medieval Bibliography
Lexikon des Mittelalters
Library of Latin Texts (CLCLT)
Mirabile
Monumenta Germaniae Historica
New Jacoby Online
New Pauly Online
Oxford Bibliographies Online
Oxford Classical Dictionary
Oxford Dictionary of Byzantium
Oxford Dictionary of the Christian Church
Patrologia Graeca
Patrologia Latina
Perseus: Greek and Roman Materials
Thesaurus Linguae Graecae
Thesaurus Linguae Latinae
TOCS-IN
Vetus Latina Database
Etymological Resources
LATIN
The most up-to-date and reliable source for Latin etymologies is:
Vaan, Michiel de. 2008. Etymological dictionary of Latin and the other Italic languages. Leiden; Boston: Brill. HOLLIS Record
Earlier coverage is available in the the following sources
Ernout, Alfred & Antoine Meillet. 1979. Dictionnaire étymologique de la langue latine: histoire des mots. 4. éd., 3. tirage augm. d'additions et de corrections nouvelles. Paris: Klincksieck. HOLLIS Record
Walde, Alois. 1938-1954. Lateinisches etymologisches Wörterbuch. 3., neubearbeitete Aufl. von J. B. Hofmann. Heidelberg: C. Winter. HOLLIS Record
GREEK
Modern etymological treatments of Greek forms may be found in:
Beekes, R. S. P. (Robert Stephen Paul). 2010. Etymological dictionary of Greek. Leiden; Boston: Brill. HOLLIS Record
Earlier coverage is available in the the following sources:
Chantraine, Pierre.1968-1980.Dictionnaire étymologique de la langue grecque : histoire des mots. 4 vols. Paris: Klincksieck. HOLLIS Record
Frisk, Hjalmar. 1955-1972. Griechisches etymologisches Wörterbuch. 3 vols. Heidelberg: C. Winter. HOLLIS Record