National Council of Teachers of Mathematics. Commission on Standards for School Mathematics. (1989). Curriculum and evaluation standards for school mathematics. The Council.
Cita Chicago (17th ed.)National Council of Teachers of Mathematics. Commission on Standards for School Mathematics. Curriculum and Evaluation Standards for School Mathematics. Reston, VA: The Council, 1989.
Cita MLA (9th ed.)National Council of Teachers of Mathematics. Commission on Standards for School Mathematics. Curriculum and Evaluation Standards for School Mathematics. The Council, 1989.
Atenció: Aquestes cites poden no estar 100% correctes.