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  1. By: Hill, Norman P - Hagan, John M - Harrison, Julian R. 3rd
    Type: Article
    In: The Wilson bulletin
    Volume: 103
    Issue: 2
    Date: 1991
    Page Range: 165--182
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Hill, Norman P - Bishop, K. David.
    Type: Article
    In: The Wilson bulletin
    Volume: 111
    Issue: 4
    Date: 1999
    Page Range: 559--560
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-