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  1. By: Osborne, T O - Colebrook-Robjent, J F R
    Type: Article
    In: Raptor research
    Volume: 16
    Issue: 3
    Date: 1982
    Page Range: 71--76
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]
  2. By: Colebrook-Robjent, J F R
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 110
    Date: 1990
    Page Range: 13--14
    Publication Info: London, British Ornithologists' Club, 1893-