Boyer, Régis,

Yggdrasill. La réligion des anciens Scandinaves . (Paris: Bibliothèque historique Payot, 1981, 1992) Authoritative and imaginative.

Cooke, Deryck,

I Saw the World End. A Study of Wagner’s Ring . (London: Clarendon

uncompleted study of Wagner’s operas is full of interesting ideas and information about the myths and Wagner’s use of them.

Nietzsche, Friedrich,

The Birth of Tragedy and The Genealogy of Morals , trans. Francis Golffing. (New York: Anchor Books, 1956)

Die Geburt der Tragödie

was first published in Germany in 1872.

O’Donoghue, Heather,

Bog aan la aqoon