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  1. By: Ulfstrand, Staffan,
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 80
    Date: 1960
    Page Range: 2--3
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: Ulfstrand, Staffan,
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 80
    Date: 1960
    Page Range: 11--13
    Publication Info: London, British Ornithologists' Club, 1893-