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  1. By: Ivor, Hance Roy,
    Type: Article
    In: The Wilson bulletin
    Volume: 56
    Issue: 2
    Date: 1944
    Page Range: 91--104
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Ivor, Hance Roy,
    Type: Article
    In: The Canadian field-naturalist
    Volume: 48
    Issue: 1
    Date: 1934-01
    Page Range: 8--10
    Publication Info: Ottawa Ottawa Field-Naturalists' Club