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  1. By: Weatherhead, Patrick J - Robertson, Raleigh J
    Type: Article
    In: The Wilson bulletin
    Volume: 89
    Issue: 4
    Date: 1977
    Page Range: 583--592
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Weatherhead, Patrick J - Clark, Robert G. - Bider, J. Roger - Titman, Rodger D
    Type: Article
    In: The Canadian field-naturalist
    Volume: 94
    Issue: 1
    Date: 1980
    Page Range: 75--79
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  3. By: Bendell, Barry E. - Weatherhead, Patrick J
    Type: Article
    In: The Canadian field-naturalist
    Volume: 96
    Issue: 3
    Date: 1982
    Page Range: 265--271
    Publication Info: Ottawa Ottawa Field-Naturalists' Club