“Verslag van de lotgevallen der Vrije Universiteit in de cursus 1950.”
[Rectorial report on the academic year 1950–51, presented on 19 Sept. 1951.]
Jaarboek der Vrije Universiteit, 1951, pp. 57–85.
An English report of the speech can be found in Free University Quarterly I (1951): 258–64.
