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  1. By: Johnson, Bruce R - Ryder, Ronald A
    Type: Article
    In: The Wilson bulletin
    Volume: 89
    Issue: 1
    Date: 1977
    Page Range: 116--121
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Linkhart, Brian D - Reynolds, Richard T. - Ryder, Ronald A
    Type: Article
    In: The Wilson bulletin
    Volume: 110
    Issue: 3
    Date: 1998
    Page Range: 342--351
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-