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  1. By: Kaufmann, Gerald W
    Type: Article
    In: The Canadian field-naturalist
    Volume: 103
    Issue: 2
    Date: 1989
    Page Range: 270--282
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Kaufmann, Gerald W
    Type: Article
    In: The Wilson bulletin
    Volume: 95
    Issue: 1
    Date: 1983
    Page Range: 42--59
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  3. By: Kaufmann, Gerald W
    Type: Article
    In: The Wilson bulletin
    Volume: 99
    Issue: 3
    Date: 1987
    Page Range: 432--440
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-