1. Correspondence between Gaetano Benedetti and Martti Siirala. Martti Siirala Archive (private), Helsinki.
2. Letters to Martti Siirala by other authors. Martti Siirala Archive (private), Helsinki.
3. Siirala, M. (1974). From a way of experiencing – towards an approach in thinking. Autobiographical notes, written in 1974. Martti Siirala Archive (private), Helsinki.
4. Bally, G. (1959). Medizin und Psychologie: Die Bedeutung der Tiefenpsychologie für die Heilkunde [Medicine and psychology: The meaning of depth psychology for healing]. Neue Zürcher Zeitung, September 19.