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  1. By: Esler, Daniel
    Type: Article
    In: The Wilson bulletin
    Volume: 102
    Issue: 3
    Date: 1990
    Page Range: 427--440
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Esler, Daniel
    Type: Article
    In: The Wilson bulletin
    Volume: 106
    Issue: 4
    Date: 1994
    Page Range: 679--688
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-