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  1. By: Clark, Tim W. - Bekoff, Marc - Campbell, Thomas M., - Hauptman, Tedd - Roberts, Bay D
    Type: Article
    In: The Canadian field-naturalist
    Volume: 103
    Issue: 3
    Date: 1989
    Page Range: 423--425
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Bekoff, Marc - Ainley, David G. - Bekoff, Anne
    Type: Article
    In: The Wilson bulletin
    Volume: 91
    Issue: 2
    Date: 1979
    Page Range: 255--270
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-