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  1. By: Rosenfield, Robert N - Bielefeldt, John - Trexel, Dale R. - Doolittle, T C J
    Type: Article
    In: The journal of raptor research
    Volume: 32
    Issue: 3
    Date: 1998
    Page Range: 189--194
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Trexel, Dale R. - Rosenfield, Robert N - Bielefeldt, John - Jacobs, Eugene A
    Type: Article
    In: The Wilson bulletin
    Volume: 111
    Issue: 1
    Date: 1999
    Page Range: 7--14
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-