Katz, Victor J.; Barton, Bill (October 2007), "Stages in the History of Algebra with Implications for Teaching", Educational Studies in Mathematics, 66 (2), Springer Netherlands: 185–201 [190–1], doi:10.1007/s10649-006-9023-7
Katz, Victor J.; Barton, Bill (October 2007), "Stages in the History of Algebra with Implications for Teaching", Educational Studies in Mathematics, 66 (2), Springer Netherlands: 185–201 [191], doi:10.1007/s10649-006-9023-7
Katz, Victor J.; Barton, Bill (October 2007), "Stages in the History of Algebra with Implications for Teaching", Educational Studies in Mathematics, 66 (2), Springer Netherlands: 185–201 [193], doi:10.1007/s10649-006-9023-7
O'Connor, John J.; Robertson, Edmund F., "Arabic mathematics: forgotten brilliance?", MacTutor History of Mathematics archive, புனித ஆண்ட்ரூசு பல்கலைக்கழகம். "Algebra was a unifying theory which allowed rational numbers, irrational numbers, geometrical magnitudes, etc., to all be treated as "algebraic objects"."
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[1] Jöran Friberg, A Geometric Algorithm with Solutions to Quadratic Equations in a Sumerian Juridical Document from Ur III Umma, CDLI, 2009.