APA-viite

Ifrah, G., & Bellos, D. (2005). Universal history of numbers: From prehistory to the invention of the computer v.2. Penguin.

Chicago-tyylinen lähdeviittaus

Ifrah, Georges, ja David Bellos. Universal History of Numbers: From Prehistory to the Invention of the Computer V.2. New Delhi: Penguin, 2005.

MLA-viite

Ifrah, Georges, ja David Bellos. Universal History of Numbers: From Prehistory to the Invention of the Computer V.2. Penguin, 2005.