Não informado. (1903). South African Journal of Science. Associated Scientific & Technical Societies of South Africa.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. South African Journal of Science. Johannesburg, Africa do Sul: Associated Scientific & Technical Societies of South Africa, 1903.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. South African Journal of Science. Associated Scientific & Technical Societies of South Africa, 1903.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.