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-Conversi, Leonard W. "Islamic Contributions." Encyclopedia Britannica Online. Encyclopedia Britannica, n.d. Web. 29 May 2014.
-Mann, Horace. "Science and Math." Science and Math. N.p., n.d. Web. 29 May 2014.
-Overbay, Shawn. "Al-Khwarizmi." Al-khwa2.html. N.p., n.d. Web. 29 May 2014.
-Rogers, Liz. "Algebra." Islamic Mathematics. N.p., n.d. Web. 29 May 2014.
-Swetz, Frank J. "Mathematical Treasures - Omar Khayyam's Algebra."Homepage. N.p., Jan. 2011. Web. 29 May 2014.
-"Algebra and Trigonometry." PBS. PBS, n.d. Web. 29 May 2014.