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Lua i Stíl Chicago (17ú heag.)South African Council for Scientific and Industrial Research. Directory of Scientific and Technical Periodicals Published in South Africa: Gids Van Wetenskaplike En Tegniese Tydskrifte in Suid-Afrika Uitgegee. [Pretoria: Publishing Division of the Council for Scientific and Industrial Research].
Lua MLA (8ú heag.)South African Council for Scientific and Industrial Research. Directory of Scientific and Technical Periodicals Published in South Africa: Gids Van Wetenskaplike En Tegniese Tydskrifte in Suid-Afrika Uitgegee. Publishing Division of the Council for Scientific and Industrial Research].