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  1. By: Weller, Milton W - Trauger, David L. - Krapu, Gary L
    Type: Article
    In: The Canadian field-naturalist
    Volume: 83
    Issue: 4
    Date: 1969
    Page Range: 344--360
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Sparling, Donald W - Krapu, Gary L
    Type: Article
    In: The Wilson bulletin
    Volume: 106
    Issue: 1
    Date: 1994
    Page Range: 62--77
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-