Não informado. (1903). South African Journal of Science. Associated Scientific & Technical Societies of South Africa.
Chicago-referens (17:e uppl.)Não informado. South African Journal of Science. Johannesburg, Africa do Sul: Associated Scientific & Technical Societies of South Africa, 1903.
MLA-referens (8:e uppl.)Não informado. South African Journal of Science. Associated Scientific & Technical Societies of South Africa, 1903.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.