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  1. By: Whalen, David M. - Watts, Bryan D., - Johnston, David W
    Type: Article
    In: The journal of raptor research
    Volume: 34
    Issue: 1
    Date: 2000
    Page Range: 42--44
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Wilson, Michael D - Watts, Bryan D.,
    Type: Article
    In: The Wilson bulletin
    Volume: 111
    Issue: 1
    Date: 1999
    Page Range: 56--60
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  3. By: Watts, Bryan D., - Byrd, Mitchell A. - Watts, Marian U.
    Type: Article
    In: The journal of raptor research
    Volume: 38
    Issue: 1
    Date: 2004
    Page Range: 47--54
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-