Cita APA

Ifrah, G. (1998). Universal history of numbers: The world's first number system. Penguin Books.

Chicago Edition Citation

Ifrah, Georges. Universal History of Numbers: The World's First Number System. New Delhi: Penguin Books, 1998.

Cita MLA

Ifrah, Georges. Universal History of Numbers: The World's First Number System. Penguin Books, 1998.