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  1. By: Craig, Timothy H. - Halford, Douglas K - Markham, O Doyle
    Type: Article
    In: The Wilson bulletin
    Volume: 91
    Issue: 1
    Date: 1979
    Page Range: 72--77
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Markham, O Doyle - Halford, Douglas K
    Type: Article
    In: The Wilson bulletin
    Volume: 94
    Issue: 2
    Date: 1982
    Page Range: 185--197
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-