National Science Resources Center (U.S.) & Smithsonian Institution. (1998). Resources for teaching middle school science. National Academy Press.
Citace podle Chicago (17th ed.)National Science Resources Center (U.S.) a Smithsonian Institution. Resources for Teaching Middle School Science. Washington, D.C: National Academy Press, 1998.
Citace podle MLA (9th ed.)National Science Resources Center (U.S.) a Smithsonian Institution. Resources for Teaching Middle School Science. National Academy Press, 1998.
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