Oxford : Clarendon Press, 1950
Second edition.

New Haven : Yale University Press, 1986

Englewood Cliffs, N.J. : Prentice-Hall, 1967

New York : Pantheon Books, 1986
1st American ed.

New York : Twayne Publishers, 1968

Cambridge, Mass. : Harvard University Press, 1965

New York : Twayne Publishers, 1966

Boston, Houghton Mifflin 1965

New York : Twayne Publishers, 1965

New York, Macmillan 1967

New York : Twayne Publishers, 1965

Englewood Cliffs, N.J. : Prentice-Hall, 1964

New York : Norton, 1979
1st ed.

Englewood Cliffs, N.J. : Prentice-Hall, Inc., 1963

Cambridge : Harvard University Press, 1966

Durham, N.C. : Duke University Press, 1969

New York : Appleton-Century-Crofts, 1951

Carbondale, Southern Illinois University Press 1963

New York, Twayne Publishers 1964

Ann Arbor, University of Michigan Press 1966