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  1. By: Watson, Joan - Fisher, Helen L - Hall, Nicola A
    Type: Article
    In: Palaeontology
    Volume: 31
    Date: 1988
    Page Range: 1029--1031
    Publication Info: London, Palaeontological Association, 1957-
  2. By: Fisher, Helen L - Watson, Joan
    Type: Article
    In: Bulletin of the British Museum (Natural History) Geology
    Volume: 37
    Issue: 3
    Date: 1983-11-24
    Page Range: 99--104
    Publication Info: London, BM(NH),
  3. By: Watson, Joan - Fisher, Helen L
    Type: Article
    In: Palaeontology
    Volume: 27
    Date: 1984
    Page Range: 719--727
    Publication Info: London, Palaeontological Association, 1957-