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  1. By: Humphrey, Philip S - Ripley, S. Dillon
    Type: Article
    In: Postilla
    Volume: 61
    Date: 1962
    Page Range: 1--21
    Publication Info: New Haven, Peabody Museum of Natural History, 1950-2004
  2. By: Humphrey, Philip S - Peterson, Roger Tory
    Type: Article
    In: The Wilson bulletin
    Volume: 90
    Issue: 4
    Date: 1978
    Page Range: 544--552
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  3. By: Humphrey, Philip S - Freund, Rudolf
    Type: Article
    In: Postilla
    Volume: 60
    Date: 1962
    Page Range: 1--11
    Publication Info: New Haven, Peabody Museum of Natural History, 1950-2004