Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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