Não informado. (1963). Annual Research Review. Chamber of Mines of South Africa.
Lua i Stíl Chicago (17ú heag.)Não informado. Annual Research Review. Johannesburg, Africa do Sul: Chamber of Mines of South Africa, 1963.
Lua MLA (8ú heag.)Não informado. Annual Research Review. Chamber of Mines of South Africa, 1963.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.