Cita APA (7th ed.)

Langer, S. (1964). Philosophy in a New key. Mentor Book.

Cita Chicago (17th ed.)

Langer, Susanne. Philosophy in a New Key. New York: Mentor Book, 1964.

Cita MLA (9th ed.)

Langer, Susanne. Philosophy in a New Key. Mentor Book, 1964.