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  1. By: Zangerl, Rainer, - Williams, Michael E
    Type: Article
    In: Palaeontology
    Volume: 18
    Date: 1975
    Page Range: 333--341
    Publication Info: London, Palaeontological Association, 1957-
  2. By: McIntosh, John S. - Williams, Michael E
    Type: Article
    In: Kirtlandia
    Volume: 43
    Date: 1988
    Page Range: 3--26
    Publication Info: Cleveland, Ohio, Cleveland Museum of Natural History,