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  1. By: Fjeldså, Jon - Krabbe, N - Ridgely, R S
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 107
    Date: 1987
    Page Range: 28--31
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: Robbins, M B - Ridgely, R S
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 111
    Date: 1991
    Page Range: 11--18
    Publication Info: London, British Ornithologists' Club, 1893-