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  1. By: Burger, Alan E. - Betts, Michael
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 121
    Date: 2001
    Page Range: 236--246
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: Burger, Alan E.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 107
    Issue: 2
    Date: 1993
    Page Range: 164--176
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  3. By: Burger, Alan E.
    Type: Article
    In: The Wilson bulletin
    Volume: 96
    Issue: 1
    Date: 1984
    Page Range: 20--33
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-