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  1. By: Stepney, Philip H. R. - Power, Dennis M
    Type: Article
    In: The Wilson bulletin
    Volume: 85
    Issue: 4
    Date: 1973
    Page Range: 452--464
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Power, Dennis M
    Type: Article
    In: The Canadian field-naturalist
    Volume: 84
    Issue: 2
    Date: 1970
    Page Range: 188--189
    Publication Info: Ottawa Ottawa Field-Naturalists' Club