€ 10,00
202 p. Wrs. (Diss.)
Antw., Nijmegen, Standaardboekhandel, Dekker & v.d.Vegt, 1946.
Ann Arbor, Univ. of Michigan Press, (1959).
Berkeley & Los Angeles, University of California Press, 1957.
Kampen, J.H. Kok, n.d.
Groningen, Tj. Willink, 1974.