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  1. By: Houston, David C - Copsey, J A
    Type: Article
    In: The journal of raptor research
    Volume: 28
    Issue: 2
    Date: 1994
    Page Range: 73--78
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Houston, David C - Hall, Allan - Frey, Hans
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 113
    Date: 1993
    Page Range: 260--263
    Publication Info: London, British Ornithologists' Club, 1893-
  3. By: Houston, David C
    Type: Article
    In: The journal of raptor research
    Volume: 28
    Issue: 1
    Date: 1994
    Page Range: 47--47
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-