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  1. By: Bierregaard, Richard O., - Stotz, Douglas F. (Douglas Forrester), - Harper, L H - Powell, George Van Nostrand
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 107
    Date: 1987
    Page Range: 134--137
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: Powell, George Van Nostrand - Bjork, Robin D - Ogden, John C - Paul, Richard T - Powell, A Harriett - Robertson, William B
    Type: Article
    In: The Wilson bulletin
    Volume: 101
    Issue: 3
    Date: 1989
    Page Range: 436--457
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-