New York ; Oxford : Oxford University Press, 1998

Harmondsworth, Middlesex : Penguin Books, 1949

New York, New American Library 1960

Berkeley, University of California Press, 1970

Paris, Garnier frères 1934

London ; New York : Cambridge University Press, 1982
2nd ed.

London,; London : Methuen [distributed by Barnes & Noble, New York,; Methuen & Co Ltd, 1973
Second edition.

London : Methuen, 1958

London, Routledge & Paul 1950

New York : Alfred A. Knopf, 1961
First edition.

Garden City, N.Y., Doubleday, 1956

Cambridge ; New York : Cambridge University Press, 1992

Baltimore : Johns Hopkins University Press, 1985

London, E. Arnold 1952
3d ed.,

New York, Columbia University Press 1961
Rev. ed.

New York And London, Harper, 1938

Oxford ; New York : Clarendon Press, 1941

The Hague, Paris, Mouton, 1967

Leiden, E.J. Brill, 1960

London : Hutchinson's University Library, 1956