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  1. By: Smith, Paul G R
    Type: Article
    In: The Wilson bulletin
    Volume: 96
    Issue: 4
    Date: 1984
    Page Range: 561--574
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Smith, Paul G R
    Type: Article
    In: The Canadian field-naturalist
    Volume: 117
    Issue: 2
    Date: 2003-04-01
    Page Range: 173--183
    Publication Info: Ottawa Ottawa Field-Naturalists' Club