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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Sibley, Charles G
    Type: Article
    In: The Wilson bulletin
    Volume: 67
    Issue: 2
    Date: 1955
    Page Range: 128--132
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Sibley, Charles G - Ahlquist, Jon E
    Type: Article
    In: Bulletin
    Volume: 39
    Date: 1972-12-01
    Page Range: 1--276
    Publication Info: New Haven, The Museum,
  3. By: Sibley, Charles G - Ahlquist, Jon E
    Type: Article
    In: The Wilson bulletin
    Volume: 94
    Issue: 2
    Date: 1982
    Page Range: 114--128
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-