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  1. By: Pettitt, John Michael
    Type: Article
    In: Bulletin of the British Museum (Natural History) Geology
    Volume: 13
    Issue: 4
    Date: 1966-10-04
    Page Range: 221--258
    Publication Info: London, BM(NH),
  2. By: Pettitt, John Michael
    Type: Article
    In: Bulletin of the British Museum (Natural History) Geology
    Volume: 10
    Issue: 3
    Date: 1965-02-26
    Page Range: 81--92
    Publication Info: London, BM(NH),