APA引文

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

Trích dẫn kiểu Chicago

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

MLA引文

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

警告：这些引文格式不一定是100％准确.