National Council of Teachers of Mathematics. Commission on Standards for School Mathematics. (1989). Curriculum and evaluation standards for school mathematics. The Council.
Citazione stile Chigago Style (17a edizione)National Council of Teachers of Mathematics. Commission on Standards for School Mathematics. Curriculum and Evaluation Standards for School Mathematics. Reston, VA: The Council, 1989.
Citatione MLA (9a ed.)National Council of Teachers of Mathematics. Commission on Standards for School Mathematics. Curriculum and Evaluation Standards for School Mathematics. The Council, 1989.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.