Kaplan, R. (1999). The nothing that is: A natural history of zero. London: The Penguin Press.
シカゴスタイル引用形Kaplan, Robert. The Nothing That Is: A Natural History of Zero. London: The Penguin Press, 1999.
MLA引用形式Kaplan, Robert. The Nothing That Is: A Natural History of Zero. London: The Penguin Press, 1999.
警告: この引用は必ずしも正確ではありません.