Literature
  • 1990
  • The lophophorate phyla Phoronida, Bryozoa, and Brachiopoda. In: P.J. Hayward & J.S. Ryland (eds), The Marine Fauna of the British Isles and North-West Europe. Vol. 2, Molluscs to Chordates. Clarendon Press, Oxford, 628-996.
  • , 1990
  • The Marine Fauna of the British Isles and North-West Europe. Clarendon Press, Oxford.
  • 1965
  • Treatise on Invertebrate Paleontology. Part H, Brachiopoda, 2 vols. The Geological Society of America, Inc. & The University Of Kansas Press, 927 pp.