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1
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2by International Union of Pure and Applied Chemistry. Committee on Teaching of Chemistry, University of the Witwatersrand (South Africa). Radmaste Centre, Somerset Educational (South Africa), Bell, Beverly, Lycoudi, M., Ovens, J., Bradley, J.D.programme and meeting document bibliotecaUNESCO
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3by International Union of Pure and Applied Chemistry. Committee on Teaching of Chemistry, University of the Witwatersrand (South Africa). Radmaste Centre, Somerset Educational (South Africa), Bell, Beverly, Lycoudi, M., Ovens, J., Bradley, J.D.programme and meeting document bibliotecaUNESCO
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4by UNESCO-Associated Centre for Microscience Experiments (South Africa), University of the Witwatersrand (South Africa). Radmaste Centre, International Union of Pure and Applied Chemistry, International Foundation for Science Education (South Africa), Thorne, B., Ovens, J., Bell, Beverly, Bradley, J.D.programme and meeting document bibliotecaUNESCO
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5by UNESCO-Associated Centre for Microscience Experiments (South Africa), University of the Witwatersrand (South Africa). Radmaste Centre, International Union of Pure and Applied Chemistry, International Foundation for Science Education (South Africa), Thorne, B., Ovens, J., Bell, Beverly, Bradley, J.D.programme and meeting document bibliotecaUNESCO