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  1. By: Siegfried, W R - Frost, P G H
    Type: Article
    In: Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn
    Volume: 24
    Date: 1973
    Page Range: 387--393
    Publication Info: Bonn, Das Forschungsinstitut,
  2. By: Knight, R S - Crowe, Tim - Siegfried, W R
    Type: Article
    In: Journal of South African botany
    Volume: 48
    Issue: 4
    Date: 1982
    Page Range: 455--480
    Publication Info: Kirstenbosch National Botanic Gardens of South Africa
  3. By: Frost, P G H - Siegfried, W R
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 90
    Date: 1970
    Page Range: 136--142
    Publication Info: London, British Ornithologists' Club, 1893-
  4. By: Siegfried, W R
    Type: Article
    In: Journal of South African botany
    Volume: 49
    Issue: 1
    Date: 1983
    Page Range: 1--43
    Publication Info: Kirstenbosch National Botanic Gardens of South Africa