APA (7th ed.) Citation

Sprigge, T. L. S. (1984). Theories of Existence. Penguin Books.

Chicago Style (17th ed.) Citation

Sprigge, T. L. S. Theories of Existence. Harmondsworth: Penguin Books, 1984.

MLA (9th ed.) Citation

Sprigge, T. L. S. Theories of Existence. Penguin Books, 1984.