Heimler, C. H., & Kaskel, A. (1974). Life science: Activity-centered program : teacher's guide : guideline for 110 experiments and activities ([2d ed.].). C.E. Merrill.
Citace podle Chicago (17th ed.)Heimler, Charles H., a Albert Kaskel. Life Science: Activity-centered Program : Teacher's Guide : Guideline for 110 Experiments and Activities. [2d ed.]. Columbus, Ohio: C.E. Merrill, 1974.
Citace podle MLA (8th ed.)Heimler, Charles H., a Albert Kaskel. Life Science: Activity-centered Program : Teacher's Guide : Guideline for 110 Experiments and Activities. [2d ed.]. C.E. Merrill, 1974.
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