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  1. By: Gunn, John William Cormack
    Type: Article
    In: Transactions of the Royal Society of South Africa
    Volume: 9
    Date: 1921
    Page Range: 197--204
    Publication Info: Cape Town, Royal Society of South Africa,
  2. By: Gunn, John William Cormack
    Type: Article
    In: Transactions of the Royal Society of South Africa
    Volume: 10
    Date: 1922
    Page Range: 55--56
    Publication Info: Cape Town, Royal Society of South Africa,