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  1. By: Ryan, Peter G - Graham, John - Sutherland, Andrew C
    Type: Article
    In: Bulletin of the African Bird Club
    Volume: 13
    Issue: 2
    Date: 2006-08
    Page Range: 197--204
    Publication Info: Cambridge, African Bird Club, 1994-
  2. By: Ryan, Peter G - Spottiswoode, Claire N - Parker, Vincent - Graham, John - Cohen, Callan - Bento, Carlos
    Type: Article
    In: Bulletin of the African Bird Club
    Volume: 6
    Issue: 2
    Date: 1999-09
    Page Range: 138--143
    Publication Info: Cambridge, African Bird Club, 1994-