1.
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Cambridge : Harvard University Press, 1966.
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2.
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New York : Oxford University Press, 1952.
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3.
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Oxford, Clarendon Press, 1962.
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4.
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New York : Oxford University Press, 1963.
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5.
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New York, Macmillan Pub. Co. c1975.
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6.
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New York, W. W. Norton [1963]
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7.
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New York, Norton [1963, c1937]
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8.
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Cambridge, Mass., Harvard University Press, 1965.
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9.
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[Toronto, Ontario] : University of Toronto Press, 1962. ©1939
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10.
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New York, Oxford University Press, 1950.
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