Cita APA (7th ed.)

Macquarrie, J. (1973). Existentialism. Penguin Books.

Cita Chicago (17th ed.)

Macquarrie, John. Existentialism. Harmondsworth: Penguin Books, 1973.

Cita MLA (9th ed.)

Macquarrie, John. Existentialism. Penguin Books, 1973.