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  1. By: David, Sheila - Berrill, Michael
    Type: Article
    In: The Canadian field-naturalist
    Volume: 101
    Issue: 1
    Date: 1997
    Page Range: 105--107
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Ross , Jay - Powles, P. M. - Berrill, Michael
    Type: Article
    In: The Canadian field-naturalist
    Volume: 91
    Issue: 4
    Date: 1977
    Page Range: 406--410
    Publication Info: Ottawa Ottawa Field-Naturalists' Club