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  1. By: Gill, Robert E., - Kincheloe, Karen L
    Type: Article
    In: The journal of raptor research
    Volume: 27
    Issue: 1
    Date: 1993
    Page Range: 34--36
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Handel, Colleen M - Gill, Robert E.,
    Type: Article
    In: The Wilson bulletin
    Volume: 104
    Issue: 1
    Date: 1992
    Page Range: 122--135
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-