Não informado. (1960). Information Circular. University of the Witwatersrand, Economic Geology Research Unit.
Lua i Stíl Chicago (17ú heag.)Não informado. Information Circular. Johannesburg, Africa do Sul: University of the Witwatersrand, Economic Geology Research Unit, 1960.
Lua MLA (8ú heag.)Não informado. Information Circular. University of the Witwatersrand, Economic Geology Research Unit, 1960.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.