1. Zur Krise der Lichtaether-Hypothese;Ehrenfest,1959
2. In memoriam P. Ehrenfest;Kramers;Physica,1933
3. Between Man and Man;Buber,1948
4. Paul Ehrenfest in Memoriam;Einstein,1950
5. Reminiscences of Professor Paul Ehrenfest;Uhlenbeck;American Journal of Physics,1956