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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: Krabbe, N - Isler, Morton L - Isler, Phyllis R - Whitney, Bret M. - Alonso, J A - Greenfield, Paul J.
    Type: Article
    In: The Wilson bulletin
    Volume: 111
    Issue: 2
    Date: 1999
    Page Range: 157--165
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  3. By: Krabbe, N
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 112
    Date: 1992
    Page Range: 169--174
    Publication Info: London, British Ornithologists' Club, 1893-
  4. By: Krabbe, N
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 120
    Date: 2000
    Page Range: 149--153
    Publication Info: London, British Ornithologists' Club, 1893-
  5. By: Fjeldså, Jon - Krabbe, N
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 106
    Date: 1986
    Page Range: 115--124
    Publication Info: London, British Ornithologists' Club, 1893-