1. Branigan, Keith. The Catuvellauni. Gloucester: Alan Sutton, 1985.
  2. Bulfinch, Thomas. The Age of Fable. Ed Martin Bucco. New York: Harper & Row, 1966.
  3. Bulfinch, Thomas. Bulfinch's Mythology: The Age of Fable; the Age of Chivalry; Legends of Charlemagne. New York: Crowell, 1970.
  4. Bulfinch, Thomas. Bullfinch's Complete Mythology. London: Spring Books, 1989 (1964).
  5. Ferguson, Arthur B. Utter Antiquity: Perceptions of Prehistory in Renaissance England. Durham: Duke University Press, 1993.
  6. Malone, Kemp. The Literature History of Hamlet: The Early Tradition. New York: Haskell House, 1964.
  7. Taylor, Marion A. A New Look at the Old Sources of Hamlet. The Netherlands: Mouton & Co, 1968.