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  1. By: Klein, B C - Bierregaard, Richard O.,
    Type: Article
    In: The journal of raptor research
    Volume: 22
    Issue: 1
    Date: 1988
    Page Range: 29--29
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Bierregaard, Richard O.,
    Type: Article
    In: The journal of raptor research
    Volume: 32
    Issue: 1
    Date: 1998
    Page Range: 19--27
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  3. By: Bierregaard, Richard O., - Lovejoy, Thomas E.
    Type: Article
    In: Instituto Nacional de Pesquisas da Amazônia
    Date: 1989-01-01
    Publication Info: Instituto Nacional de Pesquisas da Amazônia
  4. By: Bierregaard, Richard O.,
    Type: Article
    In: The Wilson bulletin
    Volume: 96
    Issue: 1
    Date: 1984
    Page Range: 1--5
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  5. By: Bierregaard, Richard O., - Stotz, Douglas F. (Douglas Forrester), - Harper, L H - Powell, George Van Nostrand
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 107
    Date: 1987
    Page Range: 134--137
    Publication Info: London, British Ornithologists' Club, 1893-