€ 7,00
VIII,318 p. Cl. (Ex library copy)
Oxf., OUP, 1960.
Paris, Bruxelles, Sequoia-Elsevier, (1969).
Den Haag, Stok/Forum, n.d.
Ann Arbor, Univ. of Michigan Press, (1959).
Berkeley & Los Angeles, University of California Press, 1957.