Não informado. (1903). South African Journal of Science. Associated Scientific & Technical Societies of South Africa.
Chicago-Zitierstil (17. Ausg.)Não informado. South African Journal of Science. Johannesburg, Africa do Sul: Associated Scientific & Technical Societies of South Africa, 1903.
MLA-Zitierstil (8. Ausg.)Não informado. South African Journal of Science. Associated Scientific & Technical Societies of South Africa, 1903.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.