APA (7th ed.) Citation

Macquarrie, J. (1977). Existentialism. Penguin Books.

Chicago Style (17th ed.) Citation

Macquarrie, John. Existentialism. Penguin Books, 1977.

MLA (9th ed.) Citation

Macquarrie, John. Existentialism. Penguin Books, 1977.

Warning: These citations may not always be 100% accurate.