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  1. By: Holthuijzen, A M A - Duley, P A - Hager, Joan C. - Smith, S A - Wood, Kristin N.
    Type: Article
    In: The journal of raptor research
    Volume: 21
    Issue: 1
    Date: 1987
    Page Range: 32--33
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Gaston, Anthony J - Smith, S A
    Type: Article
    In: The Canadian field-naturalist
    Volume: 101
    Issue: 1
    Date: 1997
    Page Range: 49--55
    Publication Info: Ottawa Ottawa Field-Naturalists' Club