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].
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)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].
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)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].