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  1. By: Collins, Joseph Stephen Henry - Mellen, Frederic Francis
    Type: Article
    In: Bulletin of the British Museum (Natural History) Geology
    Volume: 23
    Date: 1973
    Page Range: 351--388
    Publication Info: London, BM(NH),
  2. By: Collins, Joseph Stephen Henry
    Type: Article
    In: Bulletin of the British Museum (Natural History) Geology
    Volume: 40
    Date: 1986
    Page Range: 125--131
    Publication Info: London, BM(NH),