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  1. By: Bugden, Shawn C - Evans, Roger M
    Type: Article
    In: The Wilson bulletin
    Volume: 111
    Issue: 2
    Date: 1999
    Page Range: 188--194
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Bugden, Shawn C - Evans, Roger M
    Type: Article
    In: The Canadian field-naturalist
    Volume: 111
    Issue: 2
    Date: 1997
    Page Range: 234--237
    Publication Info: Ottawa Ottawa Field-Naturalists' Club