APA (7th ed.) Citation

Spark, M. (1959). Memento Mori. Penguin Books.

Chicago Style (17th ed.) Citation

Spark, Muriel. Memento Mori. Harmondsworth, England: Penguin Books, 1959.

MLA (9th ed.) Citation

Spark, Muriel. Memento Mori. Penguin Books, 1959.