Oxford : Clarendon Press, 1950
Second edition.

Port Washington, N.Y., Kennikat Press 1971

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

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

New York : Twayne Publishers, Inc., 1962

New York, Twayne Publishers 1962

New York : Twayne Publishers, Inc., 1961

Baton Rouge : Louisiana State University Press, 1965

New York, Twayne Publishers 1965

New York, Columbia University Press, 1965

New York, Columbia University Press, 1965

Minneapolis, University of Minnesota Press 1969

New York : Twayne Publishers, 1965

Bloomington : Indiana University Press, 1964

New York, N.Y. : Free Press, 1965

Cambridge : Belknap Press of Harvard University Press, 1960

Cambridge, Mass., Harvard University Press, 1968

Cambridge, Massachusetts : Harvard University Press, 1969

Englewood Cliffs, N.J. : Prentice-Hall, 1966

New York : New York University Press, 1970