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  1. By: La Roi, George
    Type: Article
    In: The Canadian field-naturalist
    Volume: 91
    Issue: 3
    Date: 1977
    Page Range: 269--272
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Ross, Michael S. - La Roi, George
    Type: Article
    In: The Canadian field-naturalist
    Volume: 104
    Issue: 3
    Date: 1990
    Page Range: 394--402
    Publication Info: Ottawa Ottawa Field-Naturalists' Club