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Leipzig: Barth, 1925
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1927
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Leipzig: Verlag von S. Hirzel, 1929
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1952
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1952
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1951
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1948
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1931
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1933
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1927
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1924
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1960
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JSTOR, 1951
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Springer Science and Business Media LLC, 1952
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JSTOR, 1952
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JSTOR, 1948
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Ovid Technologies (Wolters Kluwer Health), 1944
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Springer Science and Business Media LLC, 1944
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Ovid Technologies (Wolters Kluwer Health), 1944
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Springer Science and Business Media LLC, 1945