1.
|
London, Pall Mall P., 1968.
|
2.
|
Westport, Conn., Greenwood Press [1971, c1954]
|
3.
|
Ithaca, N.Y., Cornell University Press 1962.
|
4.
|
Freeport, N.Y., Books for Libraries Press [1971, c1950]
|
5.
|
New York, Greenwood Pub. Corp. [1969]
|
6.
|
London : George Allen & Unwin Ltd., 1965.
|
7.
|
Ithaca, N.Y., Cornell University Press [1967]
|