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  1. By: Sordahl, Tex A
    Type: Article
    In: The Wilson journal of ornithology
    Volume: 118
    Issue: 1
    Date: 2006
    Page Range: 59--63
    Publication Info: Lawrence, KS, Wilson Ornithological Society, 2006-
  2. By: Sordahl, Tex A
    Type: Article
    In: The Wilson bulletin
    Volume: 91
    Issue: 4
    Date: 1979
    Page Range: 551--574
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-