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  1. By: Van Riper, Charles, - Harrison, Julian R. 3rd
    Type: Article
    In: The Wilson bulletin
    Volume: 94
    Issue: 4
    Date: 1982
    Page Range: 463--476
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Van Riper, Charles, - Kern, Michael Don, - Sogge, M K
    Type: Article
    In: The Wilson bulletin
    Volume: 105
    Issue: 3
    Date: 1993
    Page Range: 436--447
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  3. By: Willey, David W. - Van Riper, Charles,
    Type: Article
    In: The journal of raptor research
    Volume: 34
    Issue: 1
    Date: 2000
    Page Range: 1--7
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-