Sistema numérico hindu-arábico (Portuguese Wikipedia)

Analysis of information sources in references of the Wikipedia article "Sistema numérico hindu-arábico" in Portuguese language version.

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Audun Holme, Geometry: Our Cultural Heritage, 2000
William Darrach Halsey, Emanuel Friedman (1983). Collier's Encyclopedia, with bibliography and index. [S.l.: s.n.] When the Arabian empire was expanding and contact was made with India, the Hindu numeral system and the early algorithms were adopted by the Arabs
Brezina, Corona (2006), Al-Khwarizmi: The Inventor of Algebra, ISBN 978-1-4042-0513-0, The Rosen Publishing Group, pp. 39–40 : "Historians have speculated on al-Khwarizmi's native language. Since he was born in a former Persian province, he may have spoken the Persian language. It is also possible that he spoke Khwarezmian, a language of the region that is now extinct."