Арапски бројеви — разлика између измена

* {{Cite book| first1=Richard |last1= Bulliet|first2= Pamela |last2=Crossley|first3= Daniel |last3=Headrick,|first4= Steven |last4= Hirsch|first5= Lyman |last5= Johnson| title = The Earth and Its Peoples: A Global History, Volume 1|page = 192|quote = Indian mathematicians invented the concept of zero and developed the "Arabic" numerals and system of place-value notation used in most parts of the world today|publisher = Cengage Learning|year = 2010|url = http://books.google.com/books?id=dOxl71w-jHEC&pg=PA192|isbn = 1439084742|ref=harv}}