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  1. By: Duckworth, J W - Davidson, Peter J. A. - Evans, Tom D. - Round, P D - Timmins, R. J.
    Type: Article
    In: Forktail
    Volume: 18
    Date: 2002
    Page Range: 11--44
    Publication Info: Oxford,
  2. By: Round, P D
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 103
    Date: 1983
    Page Range: 77--79
    Publication Info: London, British Ornithologists' Club, 1893-
  3. By: Wells, David R. - Round, P D - Scharringa, Jelle
    Type: Article
    In: Forktail
    Volume: 1
    Date: 1986
    Page Range: 15--20
    Publication Info: Oxford,
  4. By: Collar, Nigel J - Round, P D - Wells, David R.
    Type: Article
    In: Forktail
    Volume: 1
    Date: 1986
    Page Range: 29--51
    Publication Info: Oxford,
  5. By: Melville, D S - Round, P D
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 104
    Date: 1984
    Page Range: 127--138
    Publication Info: London, British Ornithologists' Club, 1893-
  6. By: Duckworth, J W - Round, P D - Tizard, R. J.
    Type: Article
    In: Forktail
    Volume: 27
    Date: 2011
    Page Range: 11--14
    Publication Info: Oxford,