APA (7th ed.) Citation

Macquarrie, J. (1973). Existentialism / John Macquarrie. Penguin.

Chicago Style (17th ed.) Citation

Macquarrie, John. Existentialism / John Macquarrie. London: Penguin, 1973.

MLA (9th ed.) Citation

Macquarrie, John. Existentialism / John Macquarrie. Penguin, 1973.

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