Literature
  • 1927
  • Handbook of the Echinoderms of the British Isles. Humphrey Milford, Oxford University Press: 471 pp.
  • , 1990
  • Echinodermata. In: P.J. Hayward & J.S. Ryland (eds): The Marine Fauna of the British Isles and North-West Europe, Volume 2, Molluscs to Chordates. Clarendon Press, Oxford: 839-871.
  • , 1842
  • System der Asteriden.
  • 1788-1806
  • Zoologia Danica. i.-iv.