National Academy of Sciences. National Research Council. (1963). Guidelines for development of programs in science instruction. NAS-NRC.
Citace podle Chicago (17th ed.)National Academy of Sciences. National Research Council. Guidelines for Development of Programs in Science Instruction. Washington, DC: NAS-NRC, 1963.
Citace podle MLA (9th ed.)National Academy of Sciences. National Research Council. Guidelines for Development of Programs in Science Instruction. NAS-NRC, 1963.
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