€ 8,00
XI,96 p. Hardb.
Ldn., Allen & Unwin, 1956.
med murray 1956
N.Y., Scribner's sons, n.d.
Kila, Kessinger Publ., n.d. (nineties).
Ldn., Allen & Unwin, 1948.
Oxford, Clarendon Press, (1962)