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  1. By: Baker, Allan J. - Hockey, P A R
    Type: Article
    In: The Wilson bulletin
    Volume: 96
    Issue: 4
    Date: 1984
    Page Range: 656--671
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Hockey, P A R
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 102
    Date: 1982
    Page Range: 77--83
    Publication Info: London, British Ornithologists' Club, 1893-