راجناروك: نهاية الآلهة

Sea Dragons . (Lawrence, KS: University Press of Kansas, 2003).

Ellis, Richard,

Encyclopedia of the Sea . (New York: Alfred A. Knopf, 2006).

Gibson, Ray, Benedict Hextall and Alex Rogers,

Life of Britain and North-West Europe (Oxford: Oxford University Press, 2001).

Huxley, Anthony,

. (London: Allen Lane, 1974); revised edition (London: Pelican, 1978).

Jones, Steve,

Coral: A

. (New York: Little, Brown, 2007).

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