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  1. By: Gerrard, Jonathan M. - Gerrard, P. Naomi - Bortolotti, Gary R. (Gary Roy), - Dzus, E H
    Type: Article
    In: The journal of raptor research
    Volume: 26
    Issue: 3
    Date: 1992
    Page Range: 159--166
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Miller, M J R - Wayland, Mark - Dzus, E H - Bortolotti, Gary R. (Gary Roy),
    Type: Article
    In: The journal of raptor research
    Volume: 34
    Issue: 3
    Date: 2000
    Page Range: 167--174
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  3. By: Bortolotti, Gary R. (Gary Roy), - Dzus, E H - Gerrard, Jonathan M.
    Type: Article
    In: The journal of raptor research
    Volume: 22
    Issue: 2
    Date: 1988
    Page Range: 66--67
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  4. By: Dzus, E H - Gerrard, Jonathan M.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 103
    Issue: 1
    Date: 1989
    Page Range: 29--33
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  5. By: Dzus, E H - Clark, Robert G.
    Type: Article
    In: The Wilson bulletin
    Volume: 109
    Issue: 3
    Date: 1997
    Page Range: 504--515
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-