Cita APA (7th ed.)

Frankl, V. E. (1969). The doctor and the soul: From psychotherapy to logotherapy. Penguin.

Cita Chicago (17th ed.)

Frankl, Viktor E. The Doctor and the Soul: From Psychotherapy to Logotherapy. Harmondsworth: Penguin, 1969.

Cita MLA (9th ed.)

Frankl, Viktor E. The Doctor and the Soul: From Psychotherapy to Logotherapy. Penguin, 1969.