APA

Langer S. K., . (1948). Philosophy in a new key. New York: Penguin.

Chicago

Langer Susanne K, . 1948. Philosophy in a new key. New York: Penguin.

Harvard

Langer S. K., . (1948). Philosophy in a new key. New York: Penguin.

MLA

Langer Susanne K, . Philosophy in a new key. New York: Penguin. 1948.