Higgins, P. M. (2008). Number story: From counting to cryptography. Copernicus Books.
芝加哥风格引文Higgins, Peter M. Number Story: From Counting to Cryptography. London: Copernicus Books, 2008.
MLA引文Higgins, Peter M. Number Story: From Counting to Cryptography. Copernicus Books, 2008.
警告：这些引文格式不一定是100％准确.