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Stuttgart: Perthes, 1922
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London: Macmillan, 1913
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New York: The Macmillan company, 1921
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New York: The Macmillan company, 1926
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New York: The Macmillan Company, 1922
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New York: The Macmillan Company, 1919
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London: Unwin, [1917]
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New York: Association press, 1919
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New York: Macmillan, 1917
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Cambridge University Press (CUP), 1935
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Harvard University Press, 1935