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  1. By: Simmons, R E - Avery, D. M. - Avery, Graham M.
    Type: Article
    In: The journal of raptor research
    Volume: 25
    Issue: 3
    Date: 1991
    Page Range: 63--67
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Simmons, R E
    Type: Article
    In: Raptor research
    Volume: 18
    Issue: 3
    Date: 1984
    Page Range: 103--106
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]
  3. By: Dean, W. Richard J. (William Richard John), - Dowsett, Robert J - Sakko, Alison - Simmons, R E
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 122
    Date: 2002
    Page Range: 180--185
    Publication Info: London, British Ornithologists' Club, 1893-