Johnson, M. L. P. (1974). Thirty years with an idea. University of Alabama Press for the Organic School.
Citace podle Chicago (17th ed.)Johnson, Marietta Louise Pierce. Thirty Years with an Idea. University: University of Alabama Press for the Organic School, 1974.
Citace podle MLA (9th ed.)Johnson, Marietta Louise Pierce. Thirty Years with an Idea. University of Alabama Press for the Organic School, 1974.
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