Cita APA (7a ed.)
Higgins, P. M. (2008). Number story: From counting to cryptography. Copernicus Books.
Cita Chicago Style (17a ed.)
Higgins, Peter M. Number Story: From Counting to Cryptography. London: Copernicus Books, 2008.
Cita MLA (9a ed.)
Higgins, Peter M. Number Story: From Counting to Cryptography. Copernicus Books, 2008.
Precaución: Estas citas no son 100% exactas.