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2. Frankl, V. E. (1959). Das Menschenbild der Seelenheilkunde, Kritik des dynamischen Psychologismus [The image of man in psychiatry: A critique of dynamic psychologism]. Hippokrates Verlag.
3. Frankl, V. E. (1969/1988). The will to meaning: Foundations and applications of logotherapy. Meridian. (Original work published 1969)
4. Frankl, V. E. (1984). Man’s search for meaning (3rd ed.). Pocket Books. (Original work published 1946)
5. Frankl, V. E. (2007a). Theorie und Therapie der Neurosen [Theory and therapy of mental disorders]. Reinhardt.