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  1. By: Cowles, Graham S.,
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 101
    Date: 1981
    Page Range: 383--386
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: Cowles, Graham S.,
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 100
    Date: 1980
    Page Range: 226--230
    Publication Info: London, British Ornithologists' Club, 1893-
  3. By: Cowles, Graham S.,
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 90
    Date: 1970
    Page Range: 166--168
    Publication Info: London, British Ornithologists' Club, 1893-