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  1. By: Gottfried, Bradley M - Franks, Edwin C
    Type: Article
    In: The Wilson bulletin
    Volume: 87
    Issue: 3
    Date: 1975
    Page Range: 374--383
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Gottfried, Bradley M - Andrews, Kathryn - Haug, Michaela
    Type: Article
    In: The Wilson bulletin
    Volume: 97
    Issue: 2
    Date: 1985
    Page Range: 183--190
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-