Não informado. (1963). Annual Research Review. Chamber of Mines of South Africa.
Chicago-Zitierstil (17. Ausg.)Não informado. Annual Research Review. Johannesburg, Africa do Sul: Chamber of Mines of South Africa, 1963.
MLA-Zitierstil (8. Ausg.)Não informado. Annual Research Review. Chamber of Mines of South Africa, 1963.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.