Encyclopedias
Bartlett's Familiar Quotations (1919 edition)
Brewer's Dictionary of Phrase and Fable (1894 Edition)
The Catholic Encyclopedia
Dictionary of Symbolism
Grove
Art Online
The
Internet Encyclopedia of Philosophy
MedlinePlus Health Information from the National Library
of Medicine
Middle
English Compendium
SYMBOLS.com —
Encyclopedia of Western Signs and Ideograms
Encyclopedia
Britannica Online