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  1. By: Gummer, Bill
    Type: Article
    In: The Canadian field-naturalist
    Volume: 100
    Issue: 2
    Date: 1986
    Page Range: 278--279
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Gummer, Bill - Cook, Francis R.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 108
    Issue: 2
    Date: 1994
    Page Range: 245--246
    Publication Info: Ottawa Ottawa Field-Naturalists' Club