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  1. By: Vogel, Christopher J. - Oswaldo, Maillard Z
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 127
    Date: 2007
    Page Range: 233--236
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: Vogel, Christopher J. - Sweet, P R - Hung, Le Manh - Hurley, Martha Maud,
    Type: Article
    In: Forktail
    Volume: 19
    Date: 2003
    Page Range: 21--30
    Publication Info: Oxford,