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2.
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New York, Meridian Books, 1957 [c1955]
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3.
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Ithaca, New York : Cornell University Press, [1965] ©1957
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4.
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New York, F. Ungar Pub. Co. [1958]
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5.
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New York, Ungar Pub. Co. [1960, c1955]
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6.
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Ithaca, N.Y. : Cornell University Press, c1957, 1975 printing.
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7.
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Toronto : Published by the University of Toronto Press in association with the Medieval Academy of America, c1991.
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