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  1. By: Clark, William S. - Duffy, Katharine - Gorney, Edna - Mcgrady, M - Schultz, C
    Type: Article
    In: The journal of raptor research
    Volume: 22
    Issue: 2
    Date: 1988
    Page Range: 53--58
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Gorney, Edna - Clark, William S. - Yom-Tov, Y.
    Type: Article
    In: The Wilson bulletin
    Volume: 111
    Issue: 2
    Date: 1999
    Page Range: 181--187
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-