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  1. By: Portnoy, John W
    Type: Article
    In: Transactions of the Linnaean Society of New York
    Volume: 9
    Date: 1980-12
    Page Range: 127--133
    Publication Info: New York, The Society, 1882-
  2. By: Portnoy, John W - Dodge, Wendell E
    Type: Article
    In: The Wilson bulletin
    Volume: 91
    Issue: 1
    Date: 1979
    Page Range: 104--117
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-