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  1. By: Johnson, E D H - Farnsworth, S. John
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 110
    Date: 1990
    Page Range: 7--9
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: Johnson, E D H
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 91
    Date: 1971
    Page Range: 103--107
    Publication Info: London, British Ornithologists' Club, 1893-