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.