Cita APA

Kaplan, R. (1999). The nothing that is: A natural history of zero. London: The Penguin Press.

Chicago Style Citation

Kaplan, Robert. The Nothing That Is: A Natural History of Zero. London: The Penguin Press, 1999.

Cita MLA

Kaplan, Robert. The Nothing That Is: A Natural History of Zero. London: The Penguin Press, 1999.

Atenció: Aquestes cites poden no estar 100% correctes.