Kieffer, G. H. (1987). Biotechnology, genetic engineering and society. National Association of Biology Teachers.
Lua i Stíl Chicago (17ú heag.)Kieffer, George H. Biotechnology, Genetic Engineering and Society. Reston, VA: National Association of Biology Teachers, 1987.
Lua MLA (9ú heag.)Kieffer, George H. Biotechnology, Genetic Engineering and Society. National Association of Biology Teachers, 1987.
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