Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.