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  1. By: Gerhardt, Richard P - González, Normandy Bonilla - Gerhardt, Dawn Mcannis - Flatten, Craig J
    Type: Article
    In: The Wilson bulletin
    Volume: 106
    Issue: 4
    Date: 1994
    Page Range: 629--639
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Enderson, James - Flatten, Craig J - Jenny, J P
    Type: Article
    In: The journal of raptor research
    Volume: 25
    Issue: 4
    Date: 1991
    Page Range: 123--126
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-