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Karlsruhe: Verl. Volk und Zeit, 1947
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Tübingen: Mohr, 1932
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Washington: Digest Press, 1936
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Heidelberg: Winter, 1932
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Elsevier BV, 1969
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SAGE Publications, 1969
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The Macmillan Company, 1937
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JSTOR, 1978
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MIT Press, 1978
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JSTOR, 1939
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JSTOR, 1939
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JSTOR, 1939
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JSTOR, 1937
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JSTOR, 1937
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JSTOR, 1937
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JSTOR, 1937
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SAGE Publications, 1937