Ifrah, G. (1998). Universal history of numbers: The world's first number system. Penguin Books.
Chicago Edition CitationIfrah, Georges. Universal History of Numbers: The World's First Number System. New Delhi: Penguin Books, 1998.
MLA Edition CitationIfrah, Georges. Universal History of Numbers: The World's First Number System. Penguin Books, 1998.
Warning: These citations may not always be 100% accurate.